That sounds like what a close to failing bearing does. If you are driving along at 45 the brake calipers are not touching the disks. If there is enough friction for you to feel it that means something is not rotating close to properly. In theory it could be some junk touching the tire, or in between the caliper housing and the brake disk, or even between the car and the road but each of those cases except for the junk in between the caliper housing and the brake disk makes a lot of noise when it happens and basically requires you to run over something.
A failing bearing suddenly increases its friction because bits of worn metal are in the grease between the rollers in the bearing and they temporarily stop a part of the bearing from working properly. When that happens the bearing gets hot, and has more damage.
At some point the damage is enough that the bearing stops turning, or generates enough friction that it is like one wheel having the brakes on. At that point you are not going much further, and then you are waiting for a tow truck.
At this point it just needs to be looked at.
After a brake job sometimes calipers will hang up particularly if they are old high milage etc.
If a vehicle has over 100k miles I would always recommend new calipers.
I even knew some techs that would even skimp on lubing the caliper slides.
You just never know.
Thank you so much for all of the information, freeandfreezing. You are more than helpful.