Sounds like your speed is catching up to you. And if you have 400+ reviews a day, you probably have a lot of leeches. Unless you have a pressing reason to level up once a week, I recommend you spend some time not doing lessons to get your Apprentice pile more manageable. Once that’s under control, consider slowing down your level up time to maybe 10-14 days instead of 7.
Check out your leech count with this script:
Level up slower (or the same speed), but consistently by doing a set number of lessons each day: