I am sorry I couldn't reply to your PM earlier, I also hardly watch the altcoin board.

Based on the kernel log you posted I can easily narrow down the problem to one of two.

1- The pool you use has some issues.

2- Your internet connection/ISP has some issues.

If I had to bet, I would bet on the pool, you need to try a different pool, Ideally, you want to use something like StatrumPing tool to make sure that your router has a clear route to the pool server, but it would be easier to just switch the pool on the miner and test it there.

I don't mine Zec anymore (I did for a very short period of time years ago) so I can't recommend a stable pool for that, you will need to search google for that, try using 3 different pools (don't use f2pool for this test) and report back.

You have to either quote my post or mention my name to notify me about any update you may have, I'll get a notification on Loycve's bot which I check more often than my inbox.