Our Telephone is Curious

In the last year or so, our home telephone will go dead for a while, but then work again after we plug it into different outlet for a night. Then, after a few months when it goes dead again, it can be revived the same way, but not in the same different outlet. It has to be a different different outlet, but only a particular diffferent outlet which will not make itself known until trying several outlets first. I think this can only mean that telephone makers design phones to pretend to go dead so you'll buy a new one, when really, you just need to try different outlets.