When I turn up the music the front speakers turn off or glitch really bad

If the rears work fine, I would try switching the front and rear wiring at the stereo. If the rears then cut out you probably have an issue with the pioneer. If the fronts are still cutting out try replacing the wiring with new speaker wire and check all your connections.
 
You need to break them in gently. Leave the volume low for the first 100 hours and after that go crazy!
 
Check the basics first like ensuring you have a solid ground. The head unit in my TJ kept going in and out and I had a loose ground. Tightened up the ground and everything is fine.
 
All the above suggestions are great. Especially to tighten everything. Also remember when the sound sucks compared to what they were in before, the front speakers are free air in the Jeep with no backing to help with the sound like in a box.