Rainbird maxipaws stop turning.

Seems like my maxipaws always stop working, and it's always the same point is failure. The little springs just don't have enough oomf to keep it switching directions. A lot of the heads I gotta replace every year or so... This gets very pricey and wasteful!

I was hoping to buy just a pack of replacement springs but it seems like this isn't as common a problem for anyone else and they don't exist that I can find.

Anyone else have this problem? Anyone else got a solution?