Internet connection problem

We had an internet connection problem that had been going on since last Friday until Tuesday. It just cut off suddenly and came back to normal after an hour or so. We can't figure out what was wrong. It was very annoying if we were in the middle of doing something in the computer . We finally decided to report our problem to our internet provider on Tuesday and within two hours someone came over to check it out and found that the problem was in our modem. We haven't decided to change our modem yet because since Tuesday morning until this time the connection is alright so far , no problem anymore. But once the problem will come back again, we will change the modem right away.