gosh Steph how many times I did that Paris-Perpignan trip in TGV (and believe me it was a return a couple of times a month at some point before the summer) and I never ever had a single problem with it
(not even late once
I did it only once, and it was a nightmare
And when we arrived in Paris, it was around 8pm, we were starving, suffocating, we were thirsty, we couldn't wait to be at home... but then our RER was delayed! (it was on the screen, but of course no one from the SNCF took the pain to announce it with the mic, so we didn't know why, and for how long we would have to wait).
Then it was just cancelled! we had to wait 30 min to have one.