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Trigger may be dirty, as an electrical switch the contacts can be intermittent. Also check to see if the safety plunger is set to correct depth and moving freely. Dirt can build up here......
If the hammer isn't returning, that is usually a sign of needing oil. Also, new guns that aren't broken in yet can do that as well, but oil usually helps them too.
i have two hitachi guns and had a problem with both. they worked fine then stopped working after about a year. i got a new trigger wiring from www.powertoolspares.com for about £30 and fitted it myself and their both going great. must be a problem with micro switches as theres two on the wiring loom. one guns a nr90gc and the others the newer nr90gc2 but most parts are the same in both guns.
Hi .I had the same problem with my gun,have you tried taking the fan housing off and cleaning the sparking point then oil and reassemble this seemed to wok on mine
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