FYI,
the Smartsense multisensor with CR2450 (might be Centralite model# 3321-S), with battery reading 0% for months, but still reporting temperature, has caused my Android phone-app to spin-wait-forever for the “Room” (KITCHEN) which contains that sensor, and also for the “Things” page.
now I moved that sensor to its own Room (POISONED), so I can open KITCHEN but still cannot open THINGS.
I opened a service ticket but I haven’t been contacted.