I'm getting 300 of these per hour.. Every hour.. 4 PUP's that I can't locate (seems to be some EA apk's which I never downloaded). The invalid contexts are appearing for all sorts of file types; jpg, wave, mp3, etc. I ignore them, and within seconds they flood in at a rate of 30 per minute.. Asus TF300t stock jb 4.2.1 w/ multiple users. In the time it took me to write this I received 267 notifications...
Edit: avast version 'unknown' & when I check for updates screen goes black, pops up 'avast is protecting you,' and brings me to the ever increasing log page.