dovecot - Nov 2016 - 2.2.26.0: Error: redis: Unexpected input (state=0): -ERR max number of clients reached

I use redis as quota backend (currently).

After upgrading to 2.2.26.0 I see a ton of "Error: redis: Unexpected 
input (state=0): -ERR max number of clients reached" errors.

It looks like either more Redis connections are being made, or Redis 
connections don't time out/are reused correctly anymore.

No such errors were seen in 2.2.24.

-- 
Tom