You're welcome
There's quite a story to this problem. It's been around for many years, and Foma has responded in conflicting ways to people who approached them on the topic. I experienced the problem myself, and after eliminating all other variables, suspected the film itself. So I approached Foma, they asked for samples, which I sent them, and they were very clear on it: it was a problem with the film and they would replace my rolls. Which they did, and the replacements showed the exact same defects.
A friend of mine then also approached Foma. This time, their response was different. He used a Hasselblad and Foma argued that the strain the Hasselblad film transport puts on the film causes lateral cracking of the emulsion. Well, to my eye, the problems of my friend's film didn't look like lateral cracking, but rather closely resembled the same issues I had had with it. I think they also replaced his film, although I'm not 100% positive on this.
Long story short, the issue keeps popping up from time to time. It's a shame, because in 35mm and sheet film formats, it's quite a capable film and I find it nice to work with; I use it a lot particularly in 4x5".
I hope you stick around! If you have any more questions, never hesitate to ask them here.
PS: it's important to add that Foma's other films are not susceptible to this particular problem. So their Fomapan 100 for instance works fine in 120 format - but it's a totally different kind of product, which you may or may not like. The same goes for their 400 and 320.