Bluetooth in Marshmallow is problematic, although forgetting all pairings is an odd one.
Ever do a Network Settings Reset? That loses BT pairings too...
This also has happened to me many times. Didn't know why it happens.thought this was just a one time thing, but my Moto has forgotten all my BT devices 3X now. There is no pattern to why, but it "sometimes" will happen after a cache wipe.
Any thoughts as to why? Not a huge deal, but certainly annoying...
This also has happened to me many times. Didn't know why it happens.