I used quite high gas, and the transaction is stuck for 40 hrs. The transaction was for the full amount of wallet (125ETH) so I cant do the traditional send 0 ETH as there is no gas left. Will the transaction eventually stop?
So far, I send ETH using MEW always works and only takes a short time,
so in my opinion, maybe the gas you use is less and it makes ETH you send fail or takes a long time, therefore I suggest that if you want to send ETH it's better to use high gas, so that ETH you send is faster and doesn't fail.
I always prefer put a bit little gas than its demand in order to quick confirmation time of transactions. So far, I've no issue with MEW!