Why do my bulbs need replacing every couple of months?

Hello, typically if you have repetitive bulb failure, the first place to look is to see if the housing or housings of the lamps may be allowing moisture or water inside. Water and bulbs do not get along very well, and can cause premature failure. Further, the sockets of the bulbs can have internal issues due to corrosion, overheating or melting. Have a closer look overall.

It is indeed indicative of wiring connections and bulb socket deterioration - these vehicles have know issues in that area. A google search will likely provide a bit more information.