I used Coinomi before, and I don't have any problem with that. But then I moved all of the coins inside the wallet to hardware wallet because I already buy one ledger, so I don't know if Coinomi now has a vulnerability. Although my coin amount is not much but thank GOD, I already leave that wallet because I have a new wallet, and I don't have to worry now. You should buy one ledger to store all of your coins, so you don't have to worry too.