Bluebird nest-box mapper – Maps+ Review

I had mapped 350 deployed nest box sites with push pins. All worked well. The feature I like most about Map+ is seeing where my car is as I drive around the county looking for my boxes. However, when I mapped the future next one-hundred boxes, the push pins for some of the existing boxes disappeared, sometimes returning, then gone again. Worse, not anticipating their eventual return to visibility, I re-dropped new pins where I noticed missing pins. Moreover, Suspecting the app’s memory to be exhausted, I deleted the pins for the 100 future boxes. Am I doing something wrong? Is there an option or setting or an upgrade I must purchase that accommodates 1000 push pins?
Review by JaxBluebirdman on Maps+.