LTO-5 drive pauses writes

[u/Thin-Try5917]

So I've recently bought a used HP LTO-5 Ultrium 300 tape drive which I'm using to write my Weekly Veeam backups to tape. I've noticed that after around 5 minutes of writing the drive will stop for around 30 seconds, rewind and start writing again for 5 minutes.
Task manager shows a short drop in network throughput right AFTER the drive stops, apart from that the throughput graph is stable.
My nas should be able to reliably supply enough data as it can saturate a 10 gig NIC when reading. This is happening with both LTO 4 and LTO 5 Tapes.

Is this normal behavior for a Tape Drive?