Have you tried backing up your phone, ( using the phone's backup feature), doing a factory reset, then connecting the watch to the phone and seeing if it works properly?
If it does, restore the phone (with the phone's restore feature), using the backup that you created earlier. Then you may possibly have to reconnect the watch to the phone again. You might find that the problem has now returned.
If it hasn't and it is still working properly, hopefully it has been resolved.
If it has, can you recall installing any new apps around about the time that the problem started? If not, in any case, you will now have to find out which app is causing the problem.
''If it doesn't '' can you try using the watch with a different phone to prove whether it is the phone or the watch that is causing the problem?
If it is the watch, given that it is only 3 months old, check the warranty statement in the user guide, verify your warranty period is still valid and then follow the instructions on how to claim a warranty repair/replacement for the watch.
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