Welcome to the forum ketchupbottle
I had the same problem (with Verbatim 4x DVD-R DLs) burned on a Samsung SE-S084C - paused for ages at the layer break during the scan, then when it resumed, PIF at that point were horrendous.
Do the suspect discs play back alright?
Also, you don't say what speed you used to burn the Verbies, if you're burning at the full 8x, then lowering it to 6x or 4x might help.
Also, can you perform a TRT (Transfer Rate Test) on the "problem" discs, and post the result here?
EDIT: Do you burn a lot of DL discs? If so, and I were in your shoes, I'd invest in a Pioneer 218 drive to go alongside your Sammy - the Pioneers do DL very well. Oh, and stick with the Verbies if you do end up getting a new drive.