>more than 'max_user_connections' active connections

https://github.com/zencart/zencart/issues/1344

I also get this error occasionally. The raw access logs show a legitimate IP.
my max_user_connections is 25, set by the hosting.

I was until recently on a over-specified VPS, but I'd set this to 25 for a long time, as a test, with no occurrences, so reverted to shared hosting. Now I've had a couple of cases in the last two weeks.