[tirebob]

Woah! Just saw this... Okay, a lot of variables can cause the issue.

First, studs that have been over torqued and stretched causing issues isn't lug nuts coming loose by backing off. it is usually presenting as lugs continuing to tighten and not reaching torque, and if/once torque is achieved they continue to stretch making it seem like the torque has changed. A lug nut won't normally just back off and fall off in a case like this, but the stud might break completely and fall off, or the nuts get bound up on the stud itself and when trying to loosen they bind up and break acting much like a cross threaded nut.

I should point out it isn't always being over-torqued, but over years of removal and installation studs can eventually weaken depending on the specific metal used for production. Older Toyota studs were famous for this. You see it less and less with the larger diameter studs vehicles are often using these days taking much higher torque loads, but it is still legit. Every time you tighten a lug nut, the threads and stud stretches.

Now as for studs seeming to actually loosen off even after retorquing it is hard to pinpoint on the internet of course, but I am going to be looking at things like the wheels not centring well and as such not seating well. Think a tight dirty/rusty hub/hub-centre not sitting all the way down even at torque, so as you drive it settles down even more, re-tighten and settles even more etc...

You may have a torque wrench that is not properly calibrated so your torque setting are not accurate and you are actually under torquing...

If you used a lubricant you may have used too much affecting torque settings being accurate...

We see people all the time who have a set of aftermarket wheels that require the use of hub-centric rings who when removing those wheels and re-installed stock wheels that are hub-centric, they forgot to remove the rings themselves from the car before installing the OEM wheels. This causes the ring to squish down as driving happens so the wheel keeps loosening...

The rims being used could simply be a wrong hub bore and not fitting properly, but assuming they have been used seasonally before with no issue and this is a new problem it is probably not that...

Using the wrong seat lug nut for the rims being used could also be an issue ie using a radius seat nut on an acorn seat wheel etc...

You get the idea... You need to go through it methodically and try and identify the issue that is happening.