Last night, I had an ALAC album playing via Glider UPnP, on a Yamaha amp. I set the amp to sleep after 30 mins, which would fall during last track of the album.
I’d taken my iPhone off charge as it was at 100%. When I woke up in the morning I had 10% battery left, so I went to the battery stats screen to confirm my suspicion, and Glider had accounted for 61% of power usage in the past 24 hours.
It seems that Glider had not coped well with losing its control of / connection to the UPnP device, and just hung, or worse.
I notice, however, that the album art (on at least one album) has improved in quality overnight, so there was probably a sync going on (server has 38.8k songs apparently, because I can’t only broadcast part of the server - nice one Netgear), which could account for some of that battery usage.
But, given this is iOS, surely that sync couldn’t have continued in the background unless Glider was claiming to be playing audio? Is this an intentional workaround you’ve implemented to allow a sync to finish, or did the playback error above allow for the sync?