I'd like to add that I'm not really conscious of the phone
   misbehaviors. If I knew they were malicious, I would take my devices to
   authorities or security consultants or whatnot, but I can't tell if I'm
   imagining them or not because I have amnesia around the intermittent
   things, neurologic issues that make similar experiences, and bad
   confusing flashbacks prevent investigation and verification.
   One of my big goals is having and using a device that behaves reliably.
   So hashed backups of working firmware, and a norm of reverting to them,
   would be a great step.
   I'm guessing that OpenKeychain won't stimulate frequent popups if I
   build it from source rather than downloading a binary.