Bubbles in Shaw vinyl sheet flooring

[Trailer traveler]

We have a Salem Hemisphere Travel Trailer with what the Forest River product information describes as Shaw vinyl flooring. I noticed some bubbles in the flooring near some of the heat vents. Removal of the vents exposed a very flexible flooring material that at least to me appears very similar in thickness and flexibility to rubber roofing material. Inspection of the areas around the bathroom and kitchen vents where there were bubbles showed no indication of any moisture getting to the subfloor. I later noticed some bubbles at random locations throughout the trailer. It appears that the interior walls, bed and sink cabinet were all installed after the floor was placed. When we returned from our latest trip and the heat was turned off in the trailer, all of the bubbles have disappeared and the flooring seems tight on the subfloor. Has anyone else noticed this? What if anything can/should be done?

[Bama Rambler]

The flooring is basically vinyl sheet flooring. It expands at a different rate than the wood base so anywhere that it isn't glued down well will bubble especially when running the furnace.

Unless they're quite large or are growing, I probably wouldn't worry about them too much, but if you want to fix them you can get some glue (I recommend Titebond II, but you could use vinyl floor adhesive) and a few needles and syringes and inject a little adhesive into the bubbles and work it around and then press the bubble to the floor and clean up any glue you squeeze out. I'd weight it with something and let it cure. (I'd put some wax paper down so it won't stick if any glue oozes out while it's curing.)

[HemiHemi19]

I have a 2019 Hemisphere 300bh and my floor does the same thing. Near both of my heater vents the floor seems spongy and the floor having air underneath it and I was told it was due to the design near the vents and no brace in that area.