Outlander 450L rear end sound

Well I am new to the forum and Can-Am community. I just recently purchased a 2015 Outlander 450L and already experiencing problems. First day I bought it the dealer had to keep for 2 days to solve a problem with the engine missing… turned out to be water in the gas line. Just last month I had to get the prop shaft replaced because it somehow got bent. After only 8 hours!!! and I just drove it around the house… i just washed it for its first time and it wasn’t even dirty. The dealership said it was out of phase from the factory which caused it to slowly bend so it was replaced for free under warranty.

I love my Outlander but now feel there may be another problem. I was just going down a dirt road for the first time cruising around 45-50 and noticed this awful whine in the rear end. Almost like I was driving with mud tires. It was just a low droning sound that just got more and more annoying as I was driving down the road.

Is this normal? or could it be the diff is messed up after 8 hours of an out of phase shaft? I really want to make sure this is a problem or if it just sounds this way.

Thanks!