I can not use the seed option, no password wallet and that option disabled, it's watching only wallet.
Only the "watch-only" wallet has no coin, but the other two wallet has and still have it.
In my mind, it's looks like Electrum bug, the private keys was imported to the watch only wallet, and after the shutdown wasn't saved. It worked always, hundreds of times.
You keep talking about private keys and a "watching-only" wallet... These two things are mutually exclusive!!?!
This last statement: "the private keys was imported to the watch only wallet" is actually impossible. Electrum will NOT allow you to import a private key into a watching-only wallet... just like it won't let you import a private key into a "standard" wallet that was created with a seed.
The ONLY wallet type you can import a WIF private key into is an "imported" wallet.
Yesterday i imported few private keys (what i deleted after i imported because always was fine), and 0.203 btc shown up in my wallet. Today i restarted my computer, and after that my issue comes: I have 3 wallet, and 2 of them working well, coins still there. The third one, shows all transaction history, but no bitcoins.
You say you have THREE wallets... which wallet did you import the private keys into? Or did you import some keys in wallet1, some into wallet2 and some into wallet3? or did you try and import ALL the key into ALL the wallets?