I spoke to the service manager at DVNLT in Toronto and he confirmed that LEXUS Canada has notified ALL dealers about an impeding Engine ECU reprogram and TRAC program replacement. DVNLT service should have the fix by the end of the month/early April at the latest. The fix is covered by the warranty, however DVNLT is only contacted owners who have complained about the 'problem' and have documented the complaints on record.
Hope this is helpful.