Loss of Internet connectivity for 30 seconds at a time

The problem I have been experiencing for about the past 6 weeks is that my connection will drop for an average of 30 seconds at a time. 

Initially, I did not think it was a Comcast issue because around the same time I updated to WIndows 10and I thought it was at fault. Then my wife told me that she too was experiencing the same issue and had been for around the same time. Her laptop runs win 7.

At that point I refocused my efforts on my Modem and Network. I called Comcast Business but all the person I spoke to could suggest (insisting on it in fact) was that I needed to upgrade my bandwidth.

This was never an issue before and my usage has not gone up. If anything it has diminished.

Getting no resolution with customer service I decided to try to map my loss of connectivity to see if I could find a pattern.

I purchased this program called: Net Uptime Monitor and it has worked really well. I have been logging my connectivity and indeed I get frequent interruptions all around the 30 seconds mark with slight variations.

Below is a log from yesterday and today. Today has actually been pretty reliable compared to past days before I had this software. My next step will be to connect my computer directly to the modem and log that (but I can tell the failure is at the modem because during a loss of connectivity I can still browse my network).

This situation is untaneable for me. I need to have online meetings with clients, I need to upload and download files. Everything comes to a stop for 30 seconds at a time and I noticed that in some cases these interruptions tend to cluster. I don't have the logs for last Sunday, but I suffered interruptions repeatedly for a half hour or so.

Here is the log. I would apprecviate a lead on how to fix this, keeping in mind that I have recycled my modem several times, and did all the basic stuff that's needed in thee cases. I have had broadband since the late 90's and Comcast Business for at least the last 4 or 5 yesars. This is very unusual.

4/3/2016 10:35:05 PM Log Start
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Failure Start Length
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4/3/2016 10:51:49 PM Log End
Monitor Duration 0:16:43
Failure Count 0
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4/4/2016 11:24:44 AM Log Start
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Failure Start Length
4/4/2016 11:40:56 AM 0:00:33
4/4/2016 11:56:13 AM 0:00:29
4/4/2016 12:33:31 PM 0:00:34
4/4/2016 12:52:03 PM 0:00:33
4/4/2016 12:52:47 PM 0:00:31
4/4/2016 2:00:15 PM 0:00:06
4/4/2016 5:06:38 PM 0:00:32
4/4/2016 5:46:11 PM 0:00:33
4/4/2016 5:47:00 PM 0:00:33
4/4/2016 5:47:51 PM 0:00:32
4/4/2016 5:49:32 PM 0:00:31
4/4/2016 6:42:57 PM 0:00:33
4/4/2016 6:45:26 PM 0:00:30
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4/4/2016 7:09:56 PM Log End
Monitor Duration 7:45:11
Failure Summary:
Count 13
Total Downtime 0:06:37
% Downtime 1.42
Minimum Length 0:00:06
Maximum Length 0:00:34
Average Length 0:00:30
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4/5/2016 12:01:22 PM Log Start
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Failure Start Length
4/5/2016 2:15:19 PM 0:01:34
4/5/2016 2:17:05 PM 0:01:52
4/5/2016 2:19:14 PM 0:02:56
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4/5/2016 2:33:12 PM Log End
Monitor Duration 2:31:49
Failure Summary:
Count 3
Total Downtime 0:06:22
% Downtime 4.20
Minimum Length 0:01:34
Maximum Length 0:02:56
Average Length 0:02:07
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4/5/2016 2:36:36 PM Log Start
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Failure Start Length
4/5/2016 2:59:09 PM 0:00:34
4/5/2016 3:05:40 PM 0:00:32
4/5/2016 3:06:50 PM 0:00:29
4/5/2016 3:41:22 PM 0:00:32
4/5/2016 5:11:56 PM 0:00:32
4/5/2016 5:37:13 PM 0:00:32
4/5/2016 5:38:13 PM 0:00:29
4/5/2016 5:39:12 PM 0:00:32
4/5/2016 5:43:21 PM 0:00:33