Crack drive shafts! Glue or lubricate????? What’s right????

I have the well-known cracking of the drive shafts. Both sides and that gets on my nerves. Now of course I have read a lot of things and read a lot of contradictions. The one writing that you should “stick” the shafts with a special resin. The other writing that the drive shaft toothing is to be lubricated. And… I even read about changed sem screws, you should take those from the XC90. What is the right one now? Glue or sm What about the new (modified or reinforced) semscrews. Can anyone give me reliable information? Unfortunately I did not find anything in the Vida.