That seems like a driver conflict with your windows configuration. Maybe some power saving feature enabled? I have a 7260 and I NEVER had problems with the 5 ghz band. 2.4 GHz is good but there are better performers out there (more stable). Have you tried different drivers? 16.6.0.8 is a very good version for many users. 16.8.0.6 works best for my laptop though.
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