How can I guarantee my ERC20 token transaction won’t fail?

I have been trying for several hours to send the BAT on my Trezor to an exchange using MyEtherWallet. I have done this many times previously and have never had an issue. Initially I used the Economy gas price MyEtherWallet set for me and when that didn't work I tried Regular and Fast but each time it says processing but the transactions fails after about 20 minutes. I tried with higher gas prices and higher gas limits but I'm in the dark of what to do next. I just want to get my coins on the exchange.

Any help or advice would be welcome – thanks in advance