Amanda Bynes -- Parents to the Rescue

Amanda Bynes' parents abruptly uprooted from their Texas home and moved to California to take care of their troubled daughter ... TMZ has learned.

Sources connected to the family tell us ... what triggered their decision was Amanda's DUI last April.

We're told the parents put their home in Cedar Park, TX up for sale ... hoping to make a quick deal and get to Cali ASAP, but they couldn't find a buyer.

As Amanda's situation got worse -- hit-and-runs, what looked like pot-smoking photos, and lots of strange behavior -- Bynes' folks decided they couldn't wait any longer and just leased their place out.

One source told us the parents are NOT gunning for a conservatorship (a la Britney Spears) but merely want to be near their daughter as a support system. In the past our sources say the parents were adamant -- Amanda did not have mental issues or a substance abuse problem.