I am running CQRLOG on Mint 19.3 64 bit (just upgraded but the problem started before upgrade when I was on 19.2) and over the last couple of weeks my DX cluster runs for a while and then stops. I can restart it and it works for a while but it then stops again. This happens with the cluster I have used for years DXSpots and I have also tried VE7CC with the same problem. I am using an old Dell Optiplex 380 desktop and a Panda Wireless PAU06 dongle. This all had worked just fine for a long time. I have also tied an older 802.11b/g dongle with the same problem. I have had no other problems with anything else related to our internet wifi.
73, Bill NZ0T