What do you mean by malfunctioning? Speakers cutting in and out or not working at all? Static or popping? Not satisfied with quality of sound?
As a weekend warrior, I don't watch TV camping. When I retire, I intend to put a home system in. High quality satelite speakers with a $200-300 receiver will sound as good in an RV as a house because you are not filling up a big space with sound.
You can get Aperion Intimus satelites for $269/pair. Aperion is one of several good internet direct speaker manufacturers. This is their bottom end but still good speaker. I'd run a pair in front without a center and a pair in the rear. I'd skip the subwoofer for campgrounds. If you went with a $200 AVR, you would be at around $700 which may be more than you want to spend but I think if you spend $400 on Jenson or similar you will be dissapointed and out $400.
Really need to know what your goal is. Sound bar is another option. quality speakers in front only is better than 5.1 low quality.