[thunderchildobs]

I just bought a Baader Laser Collimation Mark III.

After a few minutes of use, the laser fades until no laser light is visible.
I then turn off the collimator off and leave it for a while.
Turning it back on, the laser starts working for a short before fading away again.

I have replaced the batteries, but it did not change the behaviour.

Any suggestion?

Thanks

Brendan