It’s hard to link lack of neutering to GI stasis bouts without knowing circumstances around those bouts specifically. Notably, many rabbits are molting right now so if your rabbit it, increased fur consumption may be a factor.

Stasis aside, generally yes we can assume rabbits who are neutered are less stressed. They are not as territorially aggressive nor mating frustrated. You can imagine it can be somewhat stressful to have hormones telling you to defend and mark your territory throughout the day, as well as having the urge to hump and mate. The intensity of the stress and how it may be expressed is something we can’t really pinpoint since we can’t talk to rabbits.