I rarely bother with the GWR app nowadays. My main usage for it was buying train tickets on my way into work when I could commute by rail but I can't commute that way now because my workplace moved so I now travel by car. I could get the bus to work but that would take 3 times longer if it turned up.
For tickets I use TrainPal which has given me some quite decent reductions on occasion (and has never logged me out automatically) but if travelling from a mainline station I now have a website called Tiger bookmarked for arrivals and departures: it is used on the wall-mounted platform displays - the ones which show the railway layouts - such as at Bristol Parkway, for example, and can be found at
https://tiger.worldline.global/home. Tiger doesn't cover each and every single station though so the operator's app sometimes still proves useful.
Dave