hello
good time

i want to hold btc for 2 years or 3 years !
i want to use Electrum Wallet

There is no problem with this wallet ?

once, i hold btc with anothere wallet for 1 years and finaly after 1 years, i open wallet and saw my btc was 0.0 mBTC !!! and for this reason I'm very scared and i dont like to use  Bitaddress.org and cold wallet


help me

Best Regards