Everyone else has given amazing advice already! but here's my two cents:
This is your mind and body's way of telling you that something isn't working for you, and you've really got to listen to it - practice in general should be a focused but largely relaxed thing. Burnout usually happens when your body tries to tell you it's beyond it's limits and you push it further, out of frustration or determination - I've been there myself a few years ago, I would try to push myself to play things that were far too difficult for me, in the hope that it would make me better. Long story short, my Guitar got threw across my room, my forearm was burning & I added 3 years onto my search for the technique I've got now - I'm still searching every day.
The minute I stopped putting so much pressure & expectations on myself and started to view the process as a fun journey, rather than 'Right,
I need to grind and push &
I need to be able to do this next month because this person can, or I'm a useless guitar player etc' - I started to progress a lot quicker, and there was no negativity. Thankfully Guitar is an art-form and not an Olympic sport
You've got to be extremely patient with yourself to get to where you want & you are 100% capable of getting it! The fact that you're committing the 4 hours a day in general shows your amazing passion for your instrument and why it will never be a house decoration. It's this great instrument that you get to learn on every day. It's worth noting too, that you can sometimes progress more in a well calculated 30 min practice than a grueling 4 hour one - it's just a matter of what you're practicing and if that thing is actually helping you or just tiring you out.
In a nutshell, this is 1 of the 1,000,000 frustration points you'll encounter in your Guitar journey - it doesn't give it's self up easily at all! That's why you've got to be really kind to yourself and just know that every time you sit down with the instrument in a positive & relaxed manner you really are getting one step closer to the way you want to play - and one step more bad-ass than the person who gave the instrument up that day
The chase is where the fun is and there will always be something you're chasing.
Take a break, relax, & then get back on the horse - you've got this!