Need more info to figure out why you're getting this:
1. Does it occur in same location ?
2. You only have Front Sensors ?
3. Approaching vehicle have H.I.D. HL's on ?
4. Sunny day w/ scattered light thru tree branches ?
5. Are LTI Corp. UltraLyte Lidar used in AK ?

Any attempt to figure it out w/o more data is only speculation.