It's due to lack of lumbar support. 3 Fixes:
1) Angle the front of the seat higher so you're sitting less upright. The more upright you are the more your core must do the work.
2) If that doesn't do the trick, you can add spacers/washers underneath the front of the seat have the front end raised even more
3) Lower back support belt (used to use this on track if I knew I was doing extended sessions/days)
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