Kammala jumla mai zuwa: Rashin kwakwalwan kwamfuta yawanci yakan faru ne lokacin da akwai wasu canje-canje na zamantakewa ko na zahiri wanda ke hana wasu kwakwalwan kwamfuta daga samarwa cikin adadi mai yawa don biyan buƙata. Wani mummunan yanayin karancin kwakwalwan kwamfuta ya faru a 1988 bayan yarjejeniya tsakanin masana'antun kwakwalwan kwamfuta na Amurka da Japan ya haifar da raguwar samarwa. Canzawa zuwa sababbin hanyoyin samarwa kuma yana haifar da karancin kwakwalwan kwamfuta kamar yadda ba a gina sabbin masana'antu da sauri don biyan buƙatun sabbin kwakwalwan kwamfuta. Misali shi ne karancin kwakwalwan kwamfutar hannu a shekarar 1999, wani kuma ya kasance a lokacin da aka rarraba wasu nau'ikan kwakwalwan kwamfuta a shekarar 2004. Ƙungiyar
Girgizar kasa ta Japan ta 2011 ta haifar da wani lokaci lokacin da yake da wuya a samo dukkan sassan da ake buƙata don tsarin daban-daban.