#1
Playing the intro riff in futureal by iron maiden, and the way I have my hand position I'm using my pinky for the e note. After playing for a minute or two I start getting bad pinky cramps. Is this because my pinky is weak or am I using incorrect technique or incorrect positioning?
Gear:

Agile AL-2000
Vox ad30vt
Orange 20b bass amp
SX SPJ bass
crappy jasmine branded takamine acoustic guitar
#2
Could be all 3 being honest.

Usually its just incorrect positioning, I find.

Is it just the one song you're having trouble with, or does it happen a lot? If it happens a lot then it's probably your technique.
#3
I just tried recording a video so maybe someone could look at what my pinkys doing, and I guess i noticed its moving really far away from the string and then back, and it's already a stretch from the way my hand is positioned, so maybe this is causing the problem. I figure I'll try practicing to keep it closer to the a string and see if i still have problems.
Gear:

Agile AL-2000
Vox ad30vt
Orange 20b bass amp
SX SPJ bass
crappy jasmine branded takamine acoustic guitar