Record the symptom first
Note whether you see a freeze, an error or a consistently soft picture. Check whether it affects one authorised source or several and whether ordinary internet use on the same device is stable.
Compare, then restore
Try one relevant change, such as comparing wired and wireless access where available. Keep the original setting so you can restore it. Send the results with your device and player version if the issue continues; repeated purchases are not a troubleshooting method.