Wallet technical difficulties

Hey i downloaded zecwallet on the iphone made a account and left it for like 3 days now its not syncing takes forever and when i try to send money out it says computing transaction and just gets stuck on that no matter how long i wait please help me

I loaded it on Ywallet and this is the error i got after trying to send it out it synced to 100% but wont send just says this

ERROR: tx-expiring-soon: expiryheight is 421291
but should be at least 1734172 to avoid transaction
expiring soon

The default lightwalletd server is currently experiencing issues.
As a work around, please switch to the Zecwallet server.