This is multi-faceted:
Firstly and foremostly and I KNOW IT SOUND OBVIOUS - but check the disc for jammy finger marks, blemishes etc. I'm entirely sure you're handling your disc(s) like the crown jewells, wear white gloves and an NBC suit each time you take it out of the box ;-)
Check your blu-ray player's firmware for updates - this can iron out some problems - are you watching/listening in 3D or 2D?
If you use an amplifier also with ethernet, check for updates.
If your TV has ethernet, again, check for updates.
On the inner ring of the disc there should be an IFPI (ifpi) number - this is the laser beam recorder number used on that particular replication run from the manufacturer. On this occasion, I don't think there will be one, however there will be a bar-code for each layer on the disc - L0 - Layer zero - L1 - Layer 1 - you might need a bright light and some glasses to read it but take down all the numbers/letters for each layer.
The disc maufacturer for Kraftwerk 3D was/is Optimal Media GmbH - give them a call and ask them to run a calibration test either with your disc, or a test disc (which they should have in their archive/library when they printed the disc run you have) to test with a similar set-up/combination of BD player/TV etc. Give your firmware settings to them, player serial numbers etc. This will measure the reflectivity of the disc and how quick the laser can focus back, pitch and jitter (does your disc spin like a washing machine on the p*ss), SLT (space, layer, thickness, of the substrate polymer when pressed from the glass master) and any defects in the peaks and troughs when pressed. This will determine if it's a disc issue or not.
If your running through an AV amp, it could be what is called 'sync-words' where multiple audio streams, video streams etc. conflict at various points when there is a spike in the data - a lot of and audio/video information at once. Check for updates on your amp.
It could simply be that at this point in question, the layer-break where the laser re-focusses to change from L0 to L1 - your player may not be doing this seamlessly or quick enough causing it to freeze.
If they ask for money, tell them to s*d-off! Sounds like you've spent enough!