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Easy to see and feel. Once plug is in seat the tension is 1/4 turn at the very most. Then washer is completely compressed and do no good. As temps change the washer act like a spring and keep the set tension. Jonsered and others had coned plugs once upon a time... This a experience. Timeserts...

The washer on plug is the most common reason for failure. It is a one time thing on most plugs. If plug is re-used/re-installed and washer already is compressed it will not sit as it should in all temps.

Helicoil is a good fix, timeserts is even better. Any way you choose it comes down to how its put in. A good job with Helicoil or timsert is just as good. I like the timeserts better as they make a really nice repair that last a bit longer and sit a bit tighter with its flenge. Most times...

It happens sometimes if threads are a bad. Loose plugs or over tightened plugs is main reason. I have seen a few from bad plugs made of wrong material and don't shange shape at same time as cylinder. But if it is a good normal plug that is sitting with correct tensionm, the temp will not affect it.