Some Trezor hardware wallet users are reporting issues with their wallets and problems with Trezor backend.
You should know that with running any hardware wallet including Trezor by default you are not running full node, but you are running light wallet and you are depending on Trezor node in this case.
There are two possible solution for fixing this issue:
1. Run Trezor with other third party software wallets like
Electrum (open source),
Exodus (closed source) or Metamask/Mew(for ethereum)
2. Run your own
Full Node with Trezor
Running your own node is probably the best and safest way because you don't need to trust anyone but more work and setting up is needed from your side.
If you are holding bunch of altcoins don't expect that any hardware wallet will support them forever without issues, so better stick with Bitcoin.