Sorry - had an emergency. I'm back. Anyway, if the belts are too tight you can get heavy friction. More likely if the end caps that hold the 4 rods in the sides of the printer are too tight that can cause too much friction (hence backlash). You should be able to push the head around with just one finger on each opposite block.
Watch this video to know the correct tension for the belts (precisely with a guitar tuner app on your phone) and also maybe get an idea of how easy it should be to push the head around:
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gr5 2,294
It's almost certainly "play" or backlash (read about it on wikipedia if you aren't familar).
It happens because it is for example coming at a wall from a different direction or switching from clockwise to counter clockwise.
Play is most commonly caused by loose belts - the short belt on the motor is the most important and easiest to tighten but the long belts are important too. I know you think you tightened everything.
Play can also be caused by high friction. If the friction is too high then when it is for example moving the head to the right and the steppers stop moving, the belt is stil trying to pull the head but friction is keeping it from moving.
Play can be caused by loose parts INSIDE the print head. Try pushing on the nozzle in 4 directions
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