I don't use Zcash, but most synchronizing problem happen because you use VPN, Proxy, Tor or your IP blocked by CloudFlare & you messed up with security configuration if you use Linux OS.
But according to
reddit page, it says you're not supposed to mine to a HW wallet. Fortunately, user gikach gave a handy guide to transfer your coin manually. Even though i won't recommend jaxx.io wallet as it's buggy/have security bug.
Solution that worked for me:
Found mnemonic code converter for zec here
https://github.com/Coinomi/bip39, download it.
Enter your seed words in "BIP39 recovery phrase", choose Zcash from Coin dropdown.
Found your address and copy correspondent Private Key
Use jaxx.io wallet, chrome plugin in my case (I've tried zcash4win wallet too, but no luck, got errors).
Go to Tools->Transfer Paper wallet->Transfer ZEC Paper Wallet->Enter Private Key-> All my zec here.
Transfer zec to exchange-> done