How can the issue be reproduced? I'm observing this behavior using rlm_cache_redis, not sure if this is module-specific or general. I think there are actually 2 distinct problems, but don't want to ...
On a ~5 minute cadence (+5-10s) in a very write-heavy application, we saw a significant number of Transaction API error: Unable to start a transaction in the given time and Can't reach database server ...