I have been getting this error every other day for at least 3 weeks, maybe 4 weeks. The error will clear the next day but then will be back the day after that. The Bank of NH electronic banking manager along with the vendor that maintains their server are trying to sort this out. They have asked for log files which I provided.
I am on Windows 10, Quicken version R52.20, build 27.1.52.20. IF they find the problem, I'll post an update.