Touch n Go RFID keep failing at toll, switch back to SmartTAG?

RFID failing is usually one of a few fixable things. First, check your TNG eWallet balance and that auto reload (GO+ or reload) is on, most 'failures' are actually insufficient balance, not the tag. Second, sticker placement matters, headlamp position works better than windscreen for some cars, and if your windscreen has heavy tint or a metallic layer it can block the signal, that's a known issue. Third, a damaged or peeling sticker won't read, request a re-installation at a TNG fitment centre. Slow down approaching the RFID lane, don't tailgate the car in front so the scanner has time to read. Honestly after fixing placement and keeping balance topped up, mine works fine now. SmartTAG is a decent backup though, many people (me included) keep a SmartTAG in the car as plan B when RFID acting up. You can use both, just don't stack them active at the same lane. Keep balance topped, that solves most cases.