Also I get this red error message frequently. "BlockChainMonitor content unexpectedly finished: Unknown Http status code is given: Unexpected symbol"
I get much more rejected blocks than accepted blocks also. I also get the error you mentioned above occasionally. At other times the miner has errors or stops working and has to be restarted. I think most of the issues are with the daemon servers.
How can we get the servers to run better ?
I stopped mining for now due to too many rejected blocks, server errors and non-responsive servers.