cant hurt
Seems like your cleaning of the bottles was reasonable, oxiclean soak followed by a good rinse then into the sanitizer. Would also think if it was the bottles it could be more hit and miss.
I do the "We don't need no sticking beer gun" approach even though I have a counter pressure filler. Less stuff to clean and has been working just fine. I have stopped chilling my bottles just clean, sanitize then fill using serving pressure.