Historic toggle switch issue

[Begd]

My historic toggle switch has developed a strange issue. When selecting the neck position, the effort required to pull the selector has increased- the toggle sort of pops into the neck position. There are no sound/ interference issues, and the toggle functions in all positions, but invariably, the effort required to switch out of the neck position puts a quick flip into the bridge position. It's not a smooth flip. Any thoughts as to what causes this? I have no problem replacing it, but I don't solder, so if it is fixable, I'd obviously prefer a solution to a trip to the shop.
Thanks in advance!

 

[ARandall]

I'd look to removing the switch from the guitar if you can, and looking at the mechanics if the toggle throw. It could be something as simple as dirt inhibiting the process. But equally if the switch has been poorly made or developed an asymmetry in the way it throws then this could explain the ramp-up in force required