Dropping ISP connection

My iMac has started dropping its ISP connection again.  In January, I had this problem & thanks to help here, I thought it was fixed.  I reset the DNS settings as follows:
1. System preferences
2. Network
3. Click Advanced
4. Click DNS tab
5. Click + sign
6. Add 208.67.222.222
7. Click + sign
8. Add 208.67.220.220
9. Click OK.
10. Exit System Preferences
Now the problem has started again.  Suggestions most welcomed.

when I had issues like that the only thing that fixed it was always to call the isp and have them look at it
this with both osx, windows and ios and linux

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    Jul 05 14:37:54 Severity:5 (WAN) link state is Up.
    Jul 05 14:37:54 Severity:5 Internet Configuration leased -- host
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    Jul 05 15:12:53 Severity:5 (WAN) link state is Up.
    Jul 05 15:12:53 Severity:5 Internet Configuration leased -- host
    Jul 05 16:00:58 Severity:5 (WAN) link state is Down.
    Jul 05 16:01:10 Severity:5 (WAN) link state is Up.
    Jul 05 16:01:10 Severity:5 Internet Configuration leased -- host
    Jul 05 16:42:33 Severity:5 (WAN) link state is Down.
    Jul 05 16:42:44 Severity:5 (WAN) link state is Up.
    Jul 05 16:42:44 Severity:5 Internet Configuration leased -- host
    Jul 05 17:47:48 Severity:5 (WAN) link state is Down.
    Jul 05 17:48:00 Severity:5 (WAN) link state is Up.
    Jul 05 17:48:00 Severity:5 Internet Configuration leased -- host
    Jul 05 17:58:34 Severity:5 (WAN) link state is Down.
    Jul 05 17:58:46 Severity:5 (WAN) link state is Up.
    Jul 05 17:58:46 Severity:5 Internet Configuration leased -- host
    Jul 05 18:07:54 Severity:5 (WAN) link state is Down.
    Jul 05 18:08:06 Severity:5 (WAN) link state is Up.
    Jul 05 18:08:06 Severity:5 Internet Configuration leased -- host
    Jul 05 18:26:34 Severity:5 (WAN) link state is Down.
    Jul 05 18:26:45 Severity:5 (WAN) link state is Up.
    Jul 05 18:26:45 Severity:5 Internet Configuration leased -- host
    Jul 05 18:46:47 Severity:5 (WAN) link state is Down.
    Jul 05 18:46:59 Severity:5 (WAN) link state is Up.
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    Jul 05 19:59:11 Severity:5 (WAN) link state is Down.
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    Labview 2014 SP1 (32bit) on Windows 7 Enterprise (X64)
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    Solved!
    Go to Solution.
    Attachments:
    Chassis919Tester.vi ‏51 KB
    Symmetrical_Pulse_Generator.vi ‏55 KB

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    Bill
    (Mid-Level minion.)
    My support system ensures that I don't look totally incompetent.
    Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

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