My Vivoactive 4 keeps powering off after I save an activity and for longer activities it powers off mid-activity and won’t turn back on until I plug it in. When it does power on it shows battery at 50% ish so not due to battery running flat.

I’ve had it for 2.5 years. I was considering upgrading but reluctant to spend more money if the general lifespan of garmin product is only a couple of years. I’m very disappointed as it’s my first garmin device and I had thought garmin was a top class brand with reliable products.