Sometimes, sets of routes are just hard, I think. Indoor grading is pretty sporadic, plus it's the sweaty season which adds a grade to everything you need friction to climb! I find when I have a session like that, I climb way too quickly, don't give myself time to recover, and burn out in an hour. I can see the signs a mile off, but I can't change anything! Could be worth switching up your training though, particularly if you're pushing into V5/6. That's the right time to get more into fingerboards and (carefully) campus boards.
I'm currently back down in London for the TV's final week at work. Then I'm up north full time from this weekend, at which point I am going to check out my new local, the Leeds Depot. After the two days I spent climbing outdoors my first weekend there, I have a long list of projects that I'm going to tailor my training around. Psyched to have some specific things to train for rather than just getting really strong at one-arming off crimps (not that it isn't an incredibly useful thing to have in my locker...). Was going through the motions a bit earlier in the year, but having these targets is making me properly motivated. Trying to set myself problems on the training board which replicate the climbs below that are on my ticklist:
The Keel - 7c (V9)
The Crystal Method - 7b+ (V8/9)
Blockbuster - 7b (V8)
Did you see any of the world cup in Japan? Been saying it for a while, but Janja Garnbret is the new Adam Ondra. Strong as they come, but also just seems to see climbs differently to everyone else - would love to see her try some hard outdoor boulders and routes.