T400 goes into standby right after being woken from standby

Hi, I have a T400. When I wake it up from standby by pressing the Fn key, it wakes up, then automatically goes into standby again. I can still wake it using the Fn key but I am afraid it  might be stuck in a loop.
Any ideas where the bug could be?

How do you send the machine into standby?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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