furnace issue

hey everyone! a couple of days ago, i noticed the furnace in my forest river wildwood grand lodge was louder than usual. after that, i woke up to the rv being 50 degrees and the furnace wouldn’t kick on. i checked the sail switch as that was an issue in my jayco eagle but this one seems fine with no obstructions.

i have to turn the furnace off, wait a few minutes and then turn it back on for it to finally kick on but it won’t stay on or even reach the temperature i’ve set the thermostat to.

any suggestions?