1. at the moment they have some sync issues with the wallet
https://ledger.zendesk.com/hc/en-us/articles/115005165189-What-if-the-synchronisation-lasts-too-long-2. check their FAQ about small amounts:
https://ledger.zendesk.com/hc/en-us/articles/115005198485-Hardware-wallets-FAQCan I use a hardware wallet as a direct payout from a mining pool or a faucet?It is not recommended to receive small payments (also called dust payments) on a hardware wallet. This kind of incoming payments are typical of mining pools or faucets.
Set the payment threshold at a higher level (for instance 0.05 BTC), or use a temporary software based wallet which you'll empty every 0.05 BTC.
The reason is that the chip must sign all inputs when you want to make an outgoing transaction. Imagine that you have received 1,000 payments of 0.001 BTC. If you want to make a payment of 1 BTC then the chip will have to construct a transaction of 1,000 inputs and sign 1,000 times. Not only it will take a few hours, but you have risks that it will not manage to do it (the chip may get too hot and fault some computation etc).
If you are already in this case, the best is to restore your 24 words seed on Mycelium and empty your wallet (and stop receiving dust payments).
Interesting, what would be considered a non-dust payment for Zcash I wonder. I'm currently getting paid every 0.01 which I feel like isn't too terrible.
I'm thinking it's just a sync issue.