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Steve LowryFlag for United States of America

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Intermittent Internet Connection

I am intermittently losing my internet connection.  It is mostly my wireless connection, but I sometimes find my wired connection gone too.  Comcast has done their thing as far as refreshing the modem.  I use Airport Extremes in bridge mode to provide Wi-Fi to my house.  I will run Speedtest on my iPhone or iPad, and I see a network connection issue.  Then I can go to my wired desktop, run Speedtest and it runs fine.  I then immediately run Speedtest on my iPhone and its OK.  Sometimes when I don't get the network connection issue message on my iPhone, I get a Latency test failed message.

Can my wired PC cause me to lose connection wirelessly, or can being active on the desktop start my wireless to work again?  I am looking for places to troubleshoot the issue.  Any suggestions are welcome.  Thanks.
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Thanks for the information everyone.  Pinging my default gateway was 1ms, the external IP was 18 to 36 ms.

I forgot to mention that the two Airport Extremes are connected to each other via a Netgear powerline adapter.  In case I have a problem with the AE (3rd gen which is in bridge mode) or the powerline adapter, I have powered off this AE.  I will see if I have any more problems with this configuration.  If I don't see any problems tomorrow, I will reconnect the AE (3rd gen) directly with an Ethernet cable to the primary AE (5th gen). If the problems stay away, I know it is the powerline adapter that has gone bad.

Concerning the signal going to the modem, last week Comcast ran a new outside cable to the house and then connected it to a "new" modem and checked the signal strength.  When I am connected, I get 50-60 mbps, wired.
I'm a bit confused.  You said that the wired connections fail as well.  So how does this plan address the wired connections?
I have only seen one failure of the wired connection.  Since I removed the Airport Extreme in bridge mode, I have not experienced any problems.  I still have not reconnected this AE with a wired connection to see if I have an issue with the AE or the powerline adapter.
Thanks to everyone for their help.
@sxlowry  - You are very welcome and I was happy to help.