Flakey

adjective

1. Consisting of flakes or of small, loose masses; lying, or cleaving off, in flakes or layers; flakelike.
2. (of a person) Unreliable; likely to make plans with others but then abandon those plans.
3. (of a thing) Unreliable; working only on an intermittent basis; likely to malfunction.

   "I cannot enjoy the online game because of my flaky Internet connection."