IIRC, some won't connect to older versions as well.
Anything prior to 3.3 (as in OP's case) will not connect at all: https://twitter.com/ElectrumWallet/status/1106479573917724672Download new one (the lastest version) and import the seed phrase into the new downloaded version.
This shouldn't be necessary. Although I would never update/upgrade a wallet if for some reason you didn't have access to your seed phrase just in case, when you upgrade Electrum it shouldn't affect your wallet files and your old wallet should open without issue in the new version of Electrum.And about seed. I have seed version. But could you hint me where I can check it again just in case?