Owners/service Manual problems of the 2008 Cadillac CTS

My sunroof drain is often clogged resulting in the interior being soaked during slight or heavy rain fall. Maintenance has been done several times to no avail. Also whenever the weather is warm outside, the back doors will not unlock from the outside or when exiting the car. I always have to manually lock the doors upon leaving the vehicle. These problems have been virtually present since the car was purchased and have become a nightmare. The water log inside the vehicle almost always happen when the car is stationary.

For quite some time now I've been experiencing problems with locking/unlocking rear doors. Rear doors will not lock/unlock with keyless entry or front/passenger door pads. I have to manually cling to back to unlock doors. Have purchased several batteries for keyless remote. Due to doors remaining unlocked I cannot auto start vehicle unless I manually lock doors myself. Also computer is not recognizing keyless remote. I have purchased several batteries within the past 8 months. Car always tell me keyless remote not detected. To crank car I have to put keyless remote in middle of console to ignite. Both issues are very annoying and unsafe.