Possible causes of jackknife failures

Poor deconv
Should affect scan jack most
Moon/other + 100 degree sidelobe
Should affect scan jack by far the least
Absolute cal long term variation (imperfectly corrected)
Should affect season jack most
Mean gain change on deck rotate
Should affect deck jack most
Incorrect pair-pair rel gain cal
Should affect focal plane jack most
Incorrect A/B gain
Will cause leakage from T to pol, but mostly only deck jack failure?...
Pointing wander (seems small from point sources)
Should affect deck and season most