I have been having some issues with the GPS on my Garmin that started on a rainy ride. It was particularly problematic on that rainy day. The elevation was blatantly inaccurate. When I would descend, the elevation either stayed the same or even increased! During the first ride when this happened, I couldn't even turn off the Garmin. I had to forcibly turn off the power.

Also, Sometimes, If I am going up a hill, it now frequently goes into AutoPause. It says I'm only going 1 mph, but I know that I'm riding at 4-8 mph. Yet, when I'm walking to the bathroom at the gas station, it says I'm going 4 mph and the Garmin unpauses. Did the rain cause these issues? I thought that Garmins were waterproof. I've never had this issue before and I've done lots of riding in the rain. Would using a speed sensor at least be a bandaid solution?

I don't know if this is connected to the issue with my Garmin, but Strava isn't recording parts of the middle of my activities. For the parts that it isn't recording, it is still adding both to my eclipsed and total time. It is also recording my speed and cadence as 0. In other words, my time was inflated and my speed was deflated. It is still recording my mileage accurately. TrainingPeaks and GarminConnect are recording my activities without any interruptions.

For some context, I was in two crashes. I don't know if my Garmin was impacted in my first crash because I had a concussion. In a more recent crash, I bent the rear bracket, which I then replaced. I still don't see how that would damage the GPS, particularly since my Garmin was working well right up until that rainy ride which was a month later.

If I keep having these issues with this Garmin, what should I do?