I have noticed that mint is occasionally offline. I believe it is literally in Cuba.. so. In routstrd you can list and change the mint your associated wallet uses. It may require the Cuba mint to be back online before switching those same funds. Not entirely sure. I also have minibits as an option f...

hit the mint's v1 info endpoint straight from your machine and see if it answers. if it does, the block is on the provider side rather than yours. i keep balances on two mints now for exactly this. nostr:nprofile1qqs02f70juxwyc88gfsjzjlkzt50wkjemvvrtmt7gpfnymplvh3r9msgh38pc