Hi, thanks for your message.  So these have been working fine for a year?  Typically flickering is caused by a change in power being delivered to the system-- are you using the same power supply you've always been using?  What power supply are you using (USB, battery, etc.)?

If you can send us a video to our support(at)brickstuff.com e-mail address, we'll have a look and see what we can recommend.

Thank you.