Ok, now I changed my complete configuration into version 4.3.20191128, the latest version available at SynoCommunity. I have set the keepalive at 6000 in the Cas settings. I can open every channel, including scrambled channels. But the problem remains..... It keeps checking every 20 seconds.
NewCS:
!Naamloos3.png!
Log TVheadend:
2020-07-10 18:57:02.151 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 210 Req delay: 798 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:57:23.053 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 209 Req delay: 698 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:57:23.053 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 215 Req delay: 698 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:57:43.908 cwc: 192.168.1.56:15050: Got unexpected ECM reply (seqno: 212)
2020-07-10 18:57:44.163 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 220 Req delay: 807 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:58:05.048 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 225 Req delay: 692 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:58:26.158 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 230 Req delay: 805 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:58:47.044 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 235 Req delay: 699 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:59:08.154 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 240 Req delay: 802 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:59:29.040 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 245 Req delay: 688 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 18:59:43.102 TS: Caiway/210MHz/Fox Sports 2 HD: H264
#3531 Continuity counter error (total 1)
2020-07-10 18:59:43.119 tbl-eit: eit: 210MHz in Caiway: invalid checksum (len 1967, errors 1)
2020-07-10 18:59:43.119 tbl-pass: pass-eit: -: invalid checksum (len 1967, errors 1)
2020-07-10 18:59:50.150 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 250 Req delay: 801 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 19:00:11.052 cwc: 192.168.1.56:15050: Can not descramble service "Fox Sports 2 HD", access denied (seqno: 255 Req delay: 696 ms) from newcamd-192.168.1.56:15050-0606
2020-07-10 19:00:31.906 cwc: 192.168.1.56:15050: Got unexpected ECM reply (seqno: 258)
2020-07-10 19:00:31.906 cwc: 192.168.1.56:15050: Got unexpected ECM reply (seqno: 258)@