Songs developing a lag as they progress

I am experiencing an issue with Guitar Hero Warriors of Rock where songs will develop a video lag that starts out negligibly small and gets worse as the song progresses. For most songs it is not even noticeable, but there are a few songs in the game where the lag is very apparent and it really interferes with the gameplay.

The song in particular that made me realize this was an issue was "Do You Feel Like We Do?" by Peter Frampton. I believe it may be due to the length of the song (It is about 14 minutes long).

The song appears to play fine at first, but as you get further into it (I noticed at about 8-9 minutes in) a video lag appears to develop and gets progressively worse until the song ends. By the end of the song the lag was so bad that the audio and video was very obviously out of sync.

I am playing on an XBox 360 using an HDMI cable for the video signal and external speakers for audio (Using external speakers eliminates any possible audio lag since the signal is going directly from the XBox to the speakers). I have tested this using multiple televisions and have ruled out the possibility that it could be my TV creating the issue.

I was wondering if anyone else was experiencing this issue and if anyone had a solution?

EDIT:

Thank you for all of the great comments! Based on one of the comments it was determined that it could be the disc that was causing the issue. The only two things in my setup I have not been able to swap out and eliminate as the problem were the disc and the Xbox 360 itself, so I figured the next step would be to go out and purchase a new disc. I bought a brand new copy too so I could be sure it was not scratched or damaged in any way.

The new disc arrived today and unfortunately the problem seems to continue even with a completely different disc... So the disc itself is not the problem.

So here is what I propose...

I'm obviously not going to just go out and buy a new Xbox 360 when it may not even be the problem so my next guess is that this may be a bug within Guitar Hero Warriors of Rock itself. Since this song is so outrageously long (like really... it drags on and on...) it is probably not played very often (even by people who play the game all the time like me). If this song did have a bug, it is quite possible that it would go completely unnoticed by most of the Guitar Hero community.

I was wondering if anyone on this site has Guitar Hero Warriors of Rock for the Xbox 360 and is good enough to play the song "Do You Feel Like We Do?" by Peter Frampton on expert difficulty? (I have only tried it on expert and to be honest I don't know if i have the patience to sit through the whole thing on a lower difficulty).

If someone could test this out on their own Xbox, with their own TV and verify that the lag does not happen for them... or confirm that it does... I would greatly appreciate it!

...If you can't do expert I would guess that the problem still occurs at lower difficulties... Feel free to give it a try and report your findings but please also report the difficulty you played the song on just to be thorough ;) ...

I would really like to know if there is something wrong with my Xbox or if this could be a bug that is inherent within the game itself.

I tried everything and it looks like the Xbox is the problem. But to make things even more interesting it doesn't seem to be just my Xbox that has this problem... It seems to be a problem with ALL of the newer black models of the Xbox 360.

When my old white Xbox died I got one of the newer black models from a friend and that seemed to be when the problem started. I tried it with my old TV and with it directly plugged into the speakers so there would be no audio lag and even tried another disc... still the problem persisted. I got so fed up with it that I asked a friend if I could try their Xbox to see if the problem happened with theirs too (they also had the newer black model). I tried it with there Xbox and the same thing was happening! At this point I didn't know what to do so I gave up for a while...

But just the other day I found out that my neighbor across the street still had the old white Xbox and I figured since I tried everything else and found no solution it would at least be worth it to try the older Xbox and see if it fixed the problem...

So I borrowed my neighbor's Xbox for a night and sure enough it worked flawlessly! It wasn't the 4k TV or the disk or any settings in the game. Its the newer black Xbox. It just seems to have issues with guitar hero for some reason.

Thanks for all of the responses. I'm really surprised no one with the black model of the Xbox 360 has had this same issue and reported it... It's actually quite unfortunate because now I need to go out and buy a new Xbox, but at least I found the problem!