Just sharing recent experience. Apparently related to a Lexus Service Bulletin.
Problem: Key FOB, trunk button will not open trunk and you have to manually use the key. (This is not due to override in glove box.)
Took car to Lexus: They unplugged the wiring harness from the ECU (Electronic Control Unit? I guess). Once the harness was plugged back in the ECU reset and trunk works fine now. However they tell me it could happen again.
Cost = $117.00 to reset.
Fix- There is a fix for this as it may happen again. I'm betting the odds and hoping it won't happen again because the fix is $1850.00 for some sort of ECU or harness upgrade that solves the trunk from not working all of the sudden.