It's possible. According to an insert I just received from iO MSG/MSG+ are subject to sun outages from Feb 29 - March 7th. The outages, which Cablevision describes as "an interruption in satellite signals caused by interference from solar radiation. The interference is caused when the sun is in direct line with a communication satellite and the sun's radiation overwhelms the satellite signal. ...During this time, you may experience interference with picture quality and sound when watching television."
The outages occur twice a year, once in the fall and once in the spring.
The potential outage times for MSG/MSG+ on Saturday are from 2:11 - 2:23 pm, which should fall during the 2nd period of the Islanders' game in Boston. A potential outage is listed for the same time on Sunday, but the Isles-Devils game does not start until 3pm (2:30 pre-game).
Note that these outages will affect 100's of channels during various daylight hours during this period.
Forever1940 is the nom de plume of Eric Hornick, statistician on Islander home telecasts since January 21, 1982. Visit my blog: NYISkinny.com and follow me on Twitter @ehornick