Another SignalCheck release for the Beta Crew is rolling out now! Fixed the stale location filtering (it didn't work in the last release), adjusted the scale of the graphical signal strength bars (15-35 dB stronger now required to max out), and some internal cleanup.
Still not sure what's going on with those Samsung crashes. Please feel free to continue sharing any information you think may be relevant. Hopefully this release will be able to roll out to the public as well (web mapping data will still be limited to the Beta Crew for now). Thanks for all the help!