LG 48x suddenly only 8x

My friends LG48x drive suddenly started burning at max 8x only !
What can cause this ? LG support said it could be that ClonyXXL program has flashed the drive, which to me seems very strange.
Now any new CD-burning software installed identifies the drive as 8x.

The drive used to work ok at 48x and has been used at that speed to burn cd’s succesfully.

Any idea, anyone ?

Maybe the media inserted is rated at 8X only

That is not the case