I tried yesterday and this morning. Mine not so bad. Always on 2nd attempt then successfulI've the same problem for the past two weeks. Very irritating. Once, all transactions failed but it still showed as pending on my account, chat with CSO, somehow it disappeared (didn't get posted) after a few days.
Now still encountering the same issue, once it fails, I change to Paylah. At first I thought is M1 4G CMI again but Paylah works so is not my phone or telco.