Recurring wheel alignments needed

Well if you look at your second scan done you see in the red is the toe on the right side of the car in the front It's in the red It's zero and it needs to be what seven on each side or something like that so that adjustment is done by the tie rods from the steering rack that pushed the wheel in or out on the side kind of the opposite of camber half opposite I don't know anyway there's really no way for that to physically move because that's a threaded rod that's turned to make that adjustment and then it's locked with a nut even if it was left unlocked all that could do would be wiggle back and forth just a tiny bit It might make a noise but not go really out of adjustment You went from what it was set to last time I can't see it right this second but I'm going to guess close to 7° on the first original scan back to zero in two weeks or however long it was so unless the ball joint the outer tie rod end which is a ball joint is some kind of sloppy in its fitting loose which should allow you to jack up a wheel and then try to move that wheel side to side quickly but not a lot of distance and you should hear it rattle or make a noise clunk clunk etc The inner rack end could be damaged too that's usually the one that gets the clunking and so then that little bit of slop in that rack end or that outer tie rod end I guess it's possible that could be 7° worth but I would think you're alignment guy would have seen that very quickly but I can't think of anything else that would cause your toe in the front to go out from 7° back to zero without something being a little bit sloppy worn out etc struts and all everything should be tight or the strut mounts to the hub and where they tie in at the top of the strut tower underneath the wiper tray maybe somebody needs to verify that everything is in fact tight.

 

Just have them pay close attention to your inner and outer tie rod and rack ends If there's any slop etc

 

In my case, tire was the problem.
Initially right after tire change, I didn't feel any problem.
later the problem(going toward right side like alignment issue) started but I am sharing my car with my wife so I thought my wife hit the curve.
So, I did wheel alignment.
alignment was.... not bad but adjusted to factory recommendation.
Still.... car is going little right side.!

After several times of wheel alignment within few month and I tried to different place(at the moment I thought alignment equipment also a factor)

Later long story short.
The Tire was the problem!
tire it self is not a problem but tire installation was the problem.
Car like prius are using relatively have narrower tire.
So, some tire brands are not clearly marking "this is outside" or "rotate this way -->" kind of mark on the tire.
Without this mark installer could wrongly attach tires.
I closely look the tire patterns, I've noticed two of tires are attached with inside out.
(try take a photo for all 4 tire's pattern and compare it)
So, later I figured out tire rotating could fix this "going right side" issue.
And next tire rotate could show the symptom again!!
This is why I was never able to fix this issue with adjusting wheel alignment.

After spending 3? or 4 times of un-necessary wheel alignment.
and time!
The root cause was not the alignment.... it was TIRE!!.
After matching all 4 tire's direction.
Now my car is going straight!!!!!!!!

Hope you also can fix the issue.

Thanks!