Privacy screen on the bathroom window

Why shouldn't the film be good?

Thermal influence.

For windows exposed to a lot of sunlight, I would only apply opaque films from the outside.

Me too.

It seems "unlikely" to me that the film should be the cause

It seems logical to me. Full south side and part of the window has a film corresponds exactly to the following:

Heat buildup with large differences compared to the rest of the window

The larger the window, the greater the risk. For the bathroom with a window without hours of direct sunlight, however, I wouldn't worry.

We have also used films indoors on several occasions. The nice thing about it is that you can adjust it exactly as needed. But never on the sunny side. I can well imagine that the film itself does not stay on the glass so easily with strong sunlight.

above quote: "For panes exposed to a lot of sunlight, I would only apply opaque films from the outside" was not written by me, but by Tolentino ... but it doesn't matter

above quote: "On panes that are exposed to a lot of sunlight, I would only apply opaque films from the outside" I did not write that, Tolentino did ... but it doesn't matter

Yes, of course, I only mentioned that as a general experience on my side, namely positive, just without experience on the sun-exposed side.