If you login to your electrum wallet on mobile phone maybe want to make payment and after that what you need to do is to log out from wallet and exit otherwise if you didn't login out its easier for scammer to access your wallet since is still on active window.
Na just small thing be that, you self supposed understand am very well more than me because i know say my level never even near una own here.
Then for about wallet update, na true you talk; normally every update supposed come from their official website and not from playstore since random person fit launched attack such as vector attack.