We don't touch the bluetooth state on startup (much like we don't touch the Wi-Fi state on startup, unless it's detected as broken).
We also don't do anything with bluetooth *at all*, so, yeah, I would expect the connection to drop due to inactivity rather soon
. And then to be cut-off entirely whenever KOReader kills the Wi-Fi, as the power states for those two are unfortunately paired in the kernel.
Sidebar about the Sage: current nightlies now feature an optional (i.e., opt-in) autostandby feature, which should allow one to achieve similar power efficiency than nickel (as in, still terrible, but slightly less so ^^).
Fun fact: a PW5 drains less power while *idling* at standard frontlight levels than a Sage/Elipsa in suspend (!!). That means there won't be any miracle cure happening any time soon, because suspend is the lowest power state we can achieve.