Problems with laser performance

[Grassy67 (Gerhard Grasböck)]

my neje n40630 laser is 4 months old and has been running for about 50 hours. yesterday the performance was quickly less with almost the same setting? unfortunately useless results!
I use marlin on my skr 1.2 pro
1st setting 1500mm/min /60%

2nd setting 1500mm/min /55%
about 5 minutes later

same attitude it was always inaccurate
useless ?
Does anyone have an idea what this could be ?
is the laser already in the bucket?
the focus was always s.der same place!
am grateful for any help
hopefully legible write with translator
Thanks Grassy

[Jyez (John David Yezbak)]

Looks to me like your lens may need to be cleaned. May have some soot build up.

[Grassy67 (Gerhard Grasböck)]

Thanks for the tip just did it but without much success???

[JohnJohn (John Johnson)]

Set the laser to test fire and wiggle the laser power and control cables.

One user had reported oxidization on the connector pins. Wiggling a problematic cable may make the laser brightness fluctuate.

Wear your safety glasses.

50 hours seems like too short for a life span. I hope it is something simple.

[Grassy67 (Gerhard Grasböck)]

Thanks for your help, but I found the culprit.
my air assist nozzle kept blowing on my adjustable lens, became loose and slowly but surely misaligned.
has anyone of you ever had such a problem?
or how can i fix it?
LG from Austria

[berainlb (PY)]

@Grassy67

how can i fix it?

Can you lock the lens using a thread locker or by adding teflon tape to make it harder to come lose? I used to simply tape the lens to the body to prevent focus movement when I used an adjustable focus lens. Don’t know if that’s an option for you here.