Not sure that is possible, Minibits mint has max mint and melt balance 1mio sats and there are some 20 channels with min 10mio sats each.

Issue could be on wallet side / network related. Try to turn off all network connections and restart wallet, then turn them on again amd restart again.

As well, there is a new native version 0.2.0 where I hope to resolve some reported network issues that seem to be related to ipv4/ipv6 bugs in react native on android - I recommend to upgrade.