I don't use STRAVA anymore. I've been with RideWithGPS for a long time now. Can't say whether their app has the functionality that you need. However anytime I've ask RWGPS a support question. They get back in touch the same day. Not always with a solution, but enough to know that a actual person is at the other end asking questions and investigating. Perhaps my annual paid subscription plays a part in that immediate response.

Loss of GPS signal or a burp with your phone app crashing or such will cause a loss of the data for your track and metrics during that time. So you may end up with two activities or one activity with a straight line connecting the end of on track to the start of where it picks up again. And no data for the time things were screwed up. Same happens with both phone apps and dedicated devices. RWGPS does give a way to stitch activities together which might be of use to you. However that also is a subscription thing, IIRC. But there are tools out on the web that can help you stitch multiple activities together. And maybe even replace lost data with reasonable estimates of the missing data.

Have you checked your phones battery usage permissions and other power saving settings to ensure it's not just limiting the app's ability to run unfettered during the time of your ride?