Powerline PLW1000 slow speed unless rebooted?

Hi guys,

I've had my PLW1000 kit for over a year and has seen a total of 3 houses. The first two houses it worked great with no issues whatsoever. I've just recently moved into a new-build house with new electrics. I believe the house has two rings, with a circuit breaker downstairs. My router is downstairs and the target computer is upstairs. I've set it up so the WiFi plug is upstairs and the standard plug is next to the router downstairs.

My internet wired receives roughly 35mbps with 20ms latency. After trying the powerline, all was great as I was seeing pretty much same results as directly wired - happy days. The next day, the latency had droped to 150ms and the bandwidth was at 2mbps. After looking on mywifiext.net, the Tx/Rx Rate was ~300Mbps which seemed strange. I thought I'd give rebooting the extender a try using mywifiext.net and as soon as it was up and running all was perfectly fine. Same again the next day though. I am now in a cycle of rebooting my Powerlines every morning to achieve full potential, which I find really weird. There are no large appliances running in the house overnight, pretty much every electrical device is off. 

It feels like the kit is going into some sort of sleep mode and not really waking up. As I say, I've had the kit for over a year with no issues like this, only when I've moved into the new house has it started to happen. I've tried to update the firmware using mywifiext.net but it says I'm up to date (V1.0.0.6).

Any comments/suggestions would be greatly appreciated.

Dan