Hello there, hoping I can help here as I've had a hand in importing, adjusting and distributing Bodor lasers in the US for the past 3 years.
I hear what you are saying about the airflow reduction, so very annoying indeed, but from a functionality stand point, plenty of air still pours out of the nozzle for basic engraving and cutting. For cutting thick materials, we recommend upgrading the air compressor. This really gets her blowing, more than you would want actually.
Air flow is definitely an issue that has no easy remedy. Not a big deal if you're engraving really, but cutting does tend to swirl the smoke around in circles. This model can certainly use a proper remodel with a suction table like the Aeon NOVA10 we offer as an equivalent.
Now lets see if we can get down to this random "no fire" issue. One thing people rarely suspect is a faulty water flow sensor in the chiller. If that valve is sticking or just not opening and closing properly, it can certainly cause this. The next time you have this issue, remove the P4 green connector from your power supply and then press the red P3 test button that is right next to it. P4 is the chiller alarm and P3 lets you pulse right from the laser power supply. If it pulses, then this means the chiller is what's acting up. You can then repair the flow control sensor of replace it. It's very easy to repair and I can help you with that if it comes to it.
You mentioned having another laser. If you want to try something right away, you can swap chillers with your new laser. Then you will know for certain. Let me know how it goes.
Danny
Engraving Machines Plus, Corp.
Melbourne, FL