Hi,
Just as a warning I’m very new to firefly, but I’ve had a very similar problem to this using an MSS+, so hopefully the below might be some help.
I was also getting (daapd server crashed?) messages, which seemed to happen while a scan was happening. This in turn then meant the sql file was locked next time mt-daapd was run.
What seems to have fixed it for me is turning off playlist and iTunes XML file scanning in the advanced config. What I noticed was the song count number on the status page during a scan went from the actual number of songs I have (~3100) to some silly number like 4244232 and then the html interface crashed. Turning off playlist scanning seems to have cured this (although its only been running for a day, so no promises! 🙂
I hope this helps. If I had time I’d do a debug level 9 and really look into this, but I’ve got a 10 week old son and my time to fiddle with stuff like this is somewhat limited! 🙂
Cheers
Martin.