diff --git a/common/ca_ci.cpp b/common/ca_ci.cpp
index d50ced0..c344f08 100644
--- a/common/ca_ci.cpp
+++ b/common/ca_ci.cpp
@@ -190,7 +190,7 @@ eData waitData(int fd, unsigned char* buffer, int* len)
 	else if (retval == 0)
 	{
 #if wd_debug
-		//printf("**** wd DataTimeout\n");
+		printf("**** wd DataTimeout\n");
 #endif
 		return eDataTimeout;
 	}
@@ -214,7 +214,7 @@ eData waitData(int fd, unsigned char* buffer, int* len)
 		else if (fds.revents & POLLOUT)
 		{
 #if wd_debug
-			//printf("**** wd DataWrite\n");
+			printf("**** wd DataWrite\n");
 #endif
 			return eDataWrite;
 		}
@@ -1343,12 +1343,11 @@ void cCA::slot_pollthread(void *c)
 {
 	unsigned char data[1024 * 4];
 	eDVBCISlot* slot = (eDVBCISlot*) c;
+	bool wait = false;
 
 	while (1)
 	{
 #if HAVE_ARM_HARDWARE		/* Armbox */
-		if (slot->init && !slot->mmiOpened)
-			sleep(1);
 
 		int len = 1024 *4;
 		eData status;
@@ -1381,6 +1380,9 @@ void cCA::slot_pollthread(void *c)
 						goto FROM_FIRST;
 					}
 				}
+				/* slow down the loop, if no CI cam present */
+				printf("***sleep\n");
+				sleep(1);
 			} /* case statusnone */
 			break;
 			case eStatusWait:
@@ -1389,6 +1391,7 @@ void cCA::slot_pollthread(void *c)
 FROM_FIRST:
 				if (status == eDataReady)
 				{
+					wait = false;
 					slot->pollConnection = false;
 					if (len)
 					{
@@ -1398,6 +1401,7 @@ FROM_FIRST:
 				} /*if data ready */
 				else if (status == eDataWrite)
 				{
+					wait = true;
 					/* only writing any data here while status = eDataWrite */
 					if (!slot->sendqueue.empty())
 					{
@@ -1619,6 +1623,9 @@ FROM_FIRST:
 			if (slot->ccmgr_ready && slot->hasCCManager && slot->scrambled && !slot->SidBlackListed)
 				slot->ccmgrSession->resendKey(slot);
 		}
+		/* slow down for hd51 to avoid high cpu load */
+		if (wait && slot->init)
+			usleep(300000);
 	}
 }
 
diff --git a/libdvbci/descrambler.cpp b/libdvbci/descrambler.cpp
index 502ef1d..2d18585 100644
--- a/libdvbci/descrambler.cpp
+++ b/libdvbci/descrambler.cpp
@@ -20,8 +20,6 @@ static int desc_user_count = 0;
 
 #if HAVE_ARM_HARDWARE
 
-//static const char *descrambler_filename = "/dev/dvb/adapter0/ca0";
-//static const char *descrambler_filename = "/dev/dvb/adapter0/ca1";
 static const char *descrambler_filename = "/dev/ciplus_ca0";
 
 enum ca_descr_data_type {
@@ -43,19 +41,18 @@ struct ca_descr_data {
 };
 
 #define CA_SET_DESCR_DATA _IOW('o', 137, struct ca_descr_data)
-//#define CA_SET_DESCR_DATA _IOW('o', 10, struct ca_descr_data)
 
 int descrambler_set_key(int index, int parity, unsigned char *data)
 {
 	struct ca_descr_data d;
 	int ret;
 
-	printf("%s -> %s %s\n", FILENAME, __FUNCTION__, descrambler_filename);
+	printf("%s -> %s\n", FILENAME, __FUNCTION__);
 
 	if (descrambler_open())
 	{
-		printf("Complete Data-> Index: (%d) Parity: (%d) -> ", index, parity);
-		hexdump(data, 32);
+		//printf("Complete Data-> Index: (%d) Parity: (%d) -> ", index, parity);
+		//hexdump(data, 32);
 
 		d.index = index;
 		d.parity = (ca_descr_parity)parity;
@@ -78,7 +75,7 @@ int descrambler_set_key(int index, int parity, unsigned char *data)
 		d.length = 16;
 		d.data = data + 16;
 
-		printf("IV Index: (%d) Parity: (%d) -> ", d.index, d.parity);
+		printf("IV Index:  (%d) Parity: (%d) -> ", d.index, d.parity);
 		hexdump(d.data, 16);
 
 		ret = ioctl(desc_fd, CA_SET_DESCR_DATA, &d);
@@ -87,7 +84,6 @@ int descrambler_set_key(int index, int parity, unsigned char *data)
 			printf("CA_SET_DESCR_DATA (IV) index=%d parity=%d (errno=%d %s)\n", index, parity, errno, strerror(errno));
 		}
 
-		descrambler_close();
 	}
 	return 0;
 }
@@ -102,7 +98,7 @@ int descrambler_set_key(int index, int parity, unsigned char *data)
 {
 	struct ca_descr_data d;
 
-	printf("%s -> %s %s\n", FILENAME, __FUNCTION__, descrambler_filename);
+	printf("%s -> %s\n", FILENAME, __FUNCTION__);
 
 	index |= 0x100;
 
@@ -125,7 +121,6 @@ int descrambler_set_key(int index, int parity, unsigned char *data)
 		printf("Index: %d Parity: (%d) -> ", d.index, d.parity);
 		hexdump(d.data, 32);
 
-		descrambler_close();
 	}
 	return 0;
 }
@@ -165,6 +160,8 @@ int descrambler_set_pid(int index, int enable, int pid)
 
 bool descrambler_open(void)
 {
+	if (desc_fd > 0)
+		return true;
 	desc_fd = open(descrambler_filename, O_RDWR | O_NONBLOCK );
 	if (desc_fd <= 0) {
 		printf("cannot open %s\n", descrambler_filename);
@@ -176,6 +173,7 @@ bool descrambler_open(void)
 int descrambler_init(void)
 {
 	desc_user_count++;
+	descrambler_open();
 	printf("%s -> %s %d\n", FILENAME, __FUNCTION__, desc_user_count);
 	return 0;
 }
diff --git a/libdvbci/dvbci_ccmgr.cpp b/libdvbci/dvbci_ccmgr.cpp
index 3011d64..53f3658 100644
--- a/libdvbci/dvbci_ccmgr.cpp
+++ b/libdvbci/dvbci_ccmgr.cpp
@@ -1357,7 +1357,6 @@ void eDVBCIContentControlManagerSession::resendKey(eDVBCISlot *tslot)
 				{
 					for (unsigned int i = 0; i < slot->pids.size(); i++)
 						descrambler_set_pid((int)tslot->slot, 1, (int) slot->pids[i]);
-					descrambler_close();
 				}
 			}
 			slot->newPids = false;
@@ -1372,7 +1371,6 @@ void eDVBCIContentControlManagerSession::resendKey(eDVBCISlot *tslot)
 				{
 					for (unsigned int i = 0; i < slot->pids.size(); i++)
 						descrambler_set_pid((int)tslot->slot, 1, (int) slot->pids[i]);
-					descrambler_close();
 				}
 			}
 			slot->newPids = false;