I am using Bitcoin Core wallet and after two transmissions, the balance was balanced somewhere.

I use Bitcoin Core Wallet for my laptop. I use automatic players after booting, so I rarely use it, but suddenly I got two transmission warnings on the taskbar. On the other hand, after checking the wallet, after checking the coin, it was not recognized and the balance was changed to zero. What can you do? There is an old storage Bitcoin Core Wallet on the USB.