While this maybe coincidence, it maybe worth thinking about if you have a long line (high attenuation) and you are considering purchasing these.
Back in February I placed an order for a pair of D-Link Powerline adapters to link my Xbox 360 to the net.
I put them in and all seemed well.
However I began to notice a lot of disconnections and it happened a few times while I was on Xbox Live so contacted my ISP (Not IDNet)
They said they had noticed a lot of reauthentications (up to 10 times a day) since February and advised me to do the usual stuff, change router, filter, leads etc.
Put BT 2700 and it seemed to stabilise.
I keep that as a backup so bought a Zoom router with IPv6, sadly I couldn't leave that on long enough to thoroughly test as it was taken down by a DDOS.
So bought a DGN2200 and again noticed some disconnections.
In the meantime I was in discussion on another forum regarding these adapters and potential interference and I read some stuff that alarmed me about potential interference with aircraft communication bands.
As quite a few aircraft fly over here I decided to pull the adapters and ask for my money back.
Amazon agreed and I've notced since the connection has become more stable again.
It's not something I've seen, I do get a fair bit of low level overhead activity from two RAF locations. I guess if it stabilises your connection one can't argue with that.
Attenuation is currently 62 dB so downstream signal is quite weak.
Will be interesting to see if that changes when they go about fixing the voice fault.