Your question is not very clear to me but i will try give you answers of what you might be referring to

If your altcoin wallet is not loading properly or stuck you need to check if your data bandwidth is still enough and make sure your internet connection is very strong too

I dont know which wallet platform you are using so if you are referring to mobile wallets just head to your inbuilt phone memory and delete files related to the mobile wallet you are using and pls NOTE this is only for mobile wallets,if you try this on windows wallets you will delete the whole blockchain data