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It has been cleaned, lubed and the trigger adjusted according to the manual.
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They seem to come from friction with the 'striker' bar (the equivalent to a firing pin in this pistol) which runs inside the slide alongside the trigger group housing. There are some strange scrapes on the side of the trigger group housing (see attached pictures). Take the trigger group out of the pistol and it clicks away and works as at the same break force as expected, every time, over hundreds of tests. It well then work properly again for a while. it is set at 1kg and suddenly it needs 5kg. It has a problem where after a random number of shots (between 5 and 50 so far) it starts taking four or five times the force to get the trigger to break for a few shots.
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I have recently bought a second-hand Walther SSP-E (electronic trigger). Seeing as a forum search for SSP brought up no posts at all, I don't have great hopes for an answer!
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