[inov8]

I did not find anything in your post regarding if the problem was specifically high beams or low beams, or if you have High Intensity Discharge or Halogen low beams in your Avalon. Fortunately the word "driver" provided a solid clue. HID bulbs require a ballast that is sometimes referred to as a "driver" module.

Flicker is the most common first symptom of a HID bulb that is approaching the end of its service life. If the bulb is not replaced at that point, the flicker will become more frequent and can eventually damage the ballast ("driver"), which is more expensive than the bulb itself.

Refer to this URL for more information:

Troubleshoot HID headlights — step by step process

Learn how to troubleshoot HID headlights and understand how each component works. Get a step-by-step guide to solving common issues.

ricksfreeautorepairadvice.com

The first step is to swap right and left bulbs, and observe if the flicker moves with the bulb. If not prepared to do this yourself, I recommend to pay a local mechanic to perform the swap for you. You can purchase Philips replacements from Amazon or a ToyotaNation sponsor for ~$50 each and pay the same mechanic to do the work (less than 1 hour for both).