Vox VFS5 Footswitch

I bought this foot switch to be used with my Vox VT20. The foots switch is heavy and sturdy, and large enough for my feet. Features are also good, with multiple banks and 4 effects to choose from per bank. At the start I was really happy with it, using it for practice alone or with the band.
Basically, it works fine, but after a while I found the switching is simply not reliable enough for me. Apparently the connection to the VT20 works with different resistors for each of the 5 switches, and any contact resistance results in either the wrong effect to be enabled, or no switching at all. After a bit of contact spray things seem to work again, until you are in the middle of a song and it just refuses to switch from heavy distortion to clean sound...
It gave me too much frustration, therefore mine is not getting out of the cupboard anymore.