When this happens to me, I can almost contribute it to my form. I'm usually leaning over at the waist too much, leaning to the side, not bending my knee.
Sometimes I think we are just more tired than we think and then we expend all the energy to bowl and it is like overworking in the yard or at the gym, your muscles are fatigued.
You should be able to tell if you really feel your form is suffering from the weight - I wouldn't change it just yet if I were you. If you start to drop the ball, or drop the shoulder really bad consistently, then have someone work with you to determine if they feel the ball is too heavy. My sister, who doesn't bowl herself, but goes to one of my leagues with me every week, can tell who is throwing a ball that is too light and too heavy - just from listening to a few of my coaching sessions and observing.
Try a video of yourself and make your own assessment.
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