with all posts above to a greater or lesser extent!
With our old StorageTek L180 opening the front door did reset the library. But in all honesty I cannot remember if it actually resulted in failed saves.
But with our current Overland unit(s) this has no effect
unless tapes fill or backups complete as stated.
So I suppose it depends on the hardware itself.
Can you suspend the running jobs just in case? (Altho' looking at when you posted this you've already done one of two things - tried it or left it!)