Routers becoming unresponsive (8 Total in 2 weeks)

I have 8 routers (1 Cisco Small Biz, 1 Netgear AC1600, 6 Engenius) that have all stopped working in the last 2 weeks.  Engenius is working on the issue and is well aware of the problem, but has no idea the cause.  Atleast on the Engenius the firmware has become corrupted and can be restored to old firmware versions like 1.3.0 (When 1.4.13 is the current).  The ISP is Spectrum in 7 of the 8, and Centurylink in the other.  The Engenius routers are ESR300, ESR350, and ESR600 models.  No Engenius Access points have been effected as of yet for me personally.  I would have to believe some vulnerability is responsible for this, and hoping someone may have an idea.
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Jason JohanknechtIT ManagerAsked:
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David Johnson, CD, MVPOwnerCommented:
Update your routers, you need an update to fix the Mirai botnet and Reaper botnet
https://threatpost.com/netgear-fixes-50-vulnerabilities-in-routers-switches-nas-devices/128230/
Check if your router is vulnerable https://www.wordfence.com/blog/2017/04/check-your-router/
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Jason JohanknechtIT ManagerAuthor Commented:
I can scan more of the routers out there, but I am aware of the attacks you mentioned and have scanned a couple with the result "Your router is safe".  Atleast some of the Engenius have the latest firmware available, as they were recently installed.  The Engenius do not have an option to enable/disable the port or service I can find.
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Jason JohanknechtIT ManagerAuthor Commented:
I do believe that David is on the right track, as all along I believed a vulnerability like that is responsible.  I do want to add, that Repear made news only a couple of weeks before the first three routers went down.  That timing made me suspicious of exactly that.
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Jason JohanknechtIT ManagerAuthor Commented:
Engenius and Netgear have released new firmware that for now seem to be preventing the problem a second time.  Nothing 100% from either company regarding the actual cause.  Engenius routers are able to be recovered by connecting to the 192.168.99.9 address on a LAN port and restoring firwmare v1.3.  Then upgrading to current firmware.  I have restored about 15 Engenius routers successfully.
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