Express pay & Opal Sydney not working

Months ago i found out about express card to tap on/off at Opal readers on Sydneys public transport. For the first while it worked like a charm, but about 1-2 months ago it started to play up. More than half the time the express pass doesn’t come up when i place to phone at the reader. It’s getting so annoying and taking more time than just going the ‘old way’ of unlocking the phone

Very Disappointing