Which application are you watching these shows in, and if XBMC, SPMC or Kodi, which add-on is this in? If you could take us through exactly what you click on beforehand, we'll hopefully be able to find a more reliable source for you. In general Genesis is a good add-on within XBMC for TV series and films.
Re the Google Play Store issue, what sort of error message is displayed, does this happen with just one app update? All applications? If you search for a brand new app and try to install it, is the same error displayed? Is it possible you're running low on space? Click into Android's Settings, and click on the Storage entry. It'll mention how much free space you have left.
With all the info above, hopefully we'll be able to sort this out.