Ended unfinished session - how to trace cause?

I’ve started getting the following error quite often over the past two days ( every couple of hours):
Ended unfinished session (id=84 from 2019-02-08 05:53:28.850109)
8:54 AM components/recorder/init.py (WARNING)

How do I trace the cause? No new devices have been added - and its been fairly stable/

The above is obviously a complete restart, and for some reason on the odd occasion, on the restart, all my automatons are disabled.

It looks like when it happens, the log file is also reset?

I have got the same in the last few days, also very often. Earlier was no such problems at all.
Any ideas?

Mine is now completely down - obviously didn’t come up, will have to manually restart at home.

Starting to think it has something to do with 0.87 - I’ll rollback and see if it persists

I used to get that from time to time, especially when restarting HA a lot. That was when I was using the default database (SQLite.) Since I’ve changed to MariaDB I don’t see that anymore, and my system is much more responsive. Way better configuration; wish I had done it sooner.