If users are complaining about crashes, normally I would expect that to be an "app closed unexpectedly" type of crash
Yes they complained about the "app closed unexpectedly" crash.
the Play Store dashboard should have reports about any crashes that happened in your app with more details about them.
Currently playstore shows that there were crashes
But there are no reports to download (may be because it says that it "collects data from Android devices whose users have opted in to automatically share usage and diagnostics data")
I will share here if i get any reports.
Meanwhile thank you both for sharing info.