Green FP3 Case has stretched out

The green case I bought for my FP3+ has stretched so as to allow the phone to easily slip out thus lessening its protective function. It is about 5mm longer top to bottom and 2 - 3 from side to side. Has anyone else encountered this and also found a way to shrink it back some? I thought maybe I would try heating and cooling it in water or with a hair dryer but would like to see if someone has found a solution to this, first. It would be really nice not to have to replace it.
TIA

Welcome to the Fairphone community.

There is already a quite large thread about this issue, with a shrinking method at the end:

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Welcome to the forum

See
the following amongst others, there are other topics too

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Please continue in the topic linked to by Incanus.