Does this patient have a new formula? Also many patients cannot tolerate an abrupt change over to a new formula...think of it like this.......you know how you have a dog..( as an example, not saying the patients a dog) and that dog eats the same thing everyday........then one day you give them something new.........what happens usually? yup it goes right through them and they have bowel issues..................just basic.
Also my daughter has had g tube feedings for 17 years and with her we cannot change over to new formulas anyway but very slowly over a few days working up gradually from strengths..............also maybe ask the doctor for Lactobacilus (Acidophilus) because that can help the consistency & may ward off C diff from chronic loose stools..........my daughters GI doctor is one of the docs who developed Culturelle......it works awesome btw.
Is there anything new added to her regimen such as new meds etc? Has the patient been checked for dumping syndrome? Does everyone wash out the feeding bag after every feeding?
I can't tell you how much it drives me absolutley insane when I see the feeding bag & tubing with left over formula sitting in it because no one can be bothered to wash it out with water. I look at it as if you had left over food on a plate from a previous meal...you wouldn't add newly cooked food ontop of it would you??????

Are you venting the gtube regularly? Lots of patients get very gassy & bloated from gas and it's very painful so they need frequent venting .....To me it sounds like hemorrhoids..but I am no doc...Good luck.