Hi,
I've had my Thunderlaser for 2 years and it's worked perfectly, until about 2 weeks ago when it started engraving badly, but just in random areas, not the whole design. It is jagged and almost appears to have a wider interval or something in areas. Can anyone tell me what could be causing this please, and how I can fix it?

See photos for examples! The 'ESO' of the word 'awesome' on the comb and the 'Ch' of 'Charlotte' on the MDF.

I have just replaced the lens and mirror, and had a service, I was hoping it would fix it, and it looked like it had when I tried it at the service centre, but unfortunately not. The service guy also thought it was fixed. I thought I'd ask you on here, before I go back to them! I'm not even sure if it's hardware or software related!

Thanks!
Helen