I'm having similar issues are reached out to Stryd here's the response I received:

Thank you for contacting Stryd, and I appreciate that you like our product! I am sorry you are experiencing difficulties.

Can you share the model and firmware of your device?

You ran into a bug in our software that affects only a very small number of runners. The development team is aware of this problem, and trying to find the root cause of the problem. We expect to have updated firmware available in the near future, and may reach out to you for help testing the new firmware. Please continue to use your Stryd, and see the problem reappears.

I apologize for the inconvenience.

I'll keep you posted if I learn anything else.

Thanks. I have emailed Stryd with these details.

How long have you notice this issue?

It was an impluse purchase, so i am a little on the fence with it anyways so i rather just return it than have this linger

It has been a very infrequent experience. But when it happens it's VERY frustrating. It's happened maybe 3 times and I've had it for about 6 months. About 6 runs a week. Overall I've been pleased with it.

Hi All,

Thanks for your posts.

Please email me directly at angus@stryd.com and I will help.

Best,
Angus