I'm having issues with my F1 Ultra fiber or IR laser functioning at drastically reduced power levels.  I've seen reports on this forum of similar issues with many other F1 Ultra owners.  All of a sudden, the power output of the fiber laser is either drastically reduced or nonexistant.  Mine has progressed to the point that my fiber laser won't even mark the craft paper used when you initially calibrate the two lasers per xTool instructions.  The diode (blue) laser will mark the paper fine.   The fiber laser does not.  I've performed the following troubleshooting steps to no avail:

• The field lense protector is not installed (don't laugh….customer support actually asked me that when I submitted a help ticket).
• I've cleaned all lenses (laser and/or camera).
• I've re-homed the laser.
• I've attempted recalibration (see comment above about issues there).
• The projected red and blue dots do overlap on the base plate.
• I've performed autofocus.  I used a very accurate gauge block exactly  5/32" (0.15625") thick.  The autofocus reports a thickness of 0.122" so there's an error of 0.034" or 0.87mm.
• The protective cover is firmly seated when in operation.
• The unit is properly exhausted to the house exterior.
• There is no indication that the fiber laser is overheating.  
• My shop temperature is around 45 to 50 degrees F.
• When successfully embossing a brass coin last week, I used to see a bright white laser dot and some sparks during all portions of the embossing process.  Now I see very little (if any) white light on the brass coin.  There is some marking of the coin's surface that is occuring but it certainly will no longer emboss.
• Both the xTool Creative Space software and the unit's firmware are up-to-date.
• Neither my coin material nor the settings have changed since my last successful embossing.

As I mentioned earlier, I have submitted a help ticket; however, customer support either didn't fully read or comprehend the troubleshooting steps I've already taken because they asked me to perform some of the same steps I documented on my initial help ticket submission.  I politely had to remind them that I've already performed their suggested troubleshooting steps.  Since it took about 24 hours to get my first response from customer service, I anticipate having to wait another 24 hours before I receive my next reply.  Is this really how xTool runs their customer support?  I'm a practicing mechanical engineer so it's fair to say I'm a bit above average in my technical aptitude and troubleshooting skills so please xTool, give me something I can do to make progress in this endeavor instead of asking me to verify that the lense cover is not installed!