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.