The latest firmware is 1.1.3 for HS100 and 1.1.4 for HS110 EU version. You can find the current version on the device settings page of the plug on Kasa .

I did a comparison. There is difference for the device itself just the name is different. It seems that only the one sold in Walmart has the name KB130.

Correct firmware. Did you extract the firmware to a GGL file? There is another possible reason is that the current firmware is already the latest one.

Your issue need some detail troubleshooting. You'd better contact tp-link support for help. support email: support.usa@tp-link.com

Hi cuulblu, you can ask roku support for help. They may provide you some valuable suggestion.

Hi Serge, To locate the issue, you can unplug the repeaters and connect some laptops or phones to the router and check whether they will drop. If they still drop, you can contact tp-link support for...