I'm a bit at my wits' end (not that I know that much about bikes). I used an old Gazelle Formula Randonneur frame and switched out most of the parts. However, after some time of (rather light) driving, the wheel always comes lose and starts jamming.
Either the wheel isn't centered anymore and rubs on the frame where you can see "FORMULA RANDONNEUR" written.
Or it rubs b/w the cassette and the frame:
The only way I can prevent the wheels hinge from being too loose, is to tightening it down so hard that the wheel won't move :)
I went to a bike shop near but they only told me to simply readjust the wheel. While I am able to do that, I don't want to do it on a weekly basis or in the middle of the night. As far as they were concerned "this wasn't broken" -- but this can't be the solution to the problem, I hope.
I also found Rear wheel won't move or keeps falling off but I don't know how well this translates from a disk brake bike to mine.
Do you have any suggestions?