WiFi related issues have been my only problem with my JuiceBoxes (2), as well. My first JB (purchased last July) has the original Roving Network WiFi module, and all other available options. My other JB, which I purchased recently, is the option-less Basic model, with the new AckMe module. In my case, the RN module has worked well since it was reprogrammed by the eMW, but unfortunately only enables the Android app to be used in a "read only" mode. My AckMe equipped JB fully support the app, but I had a difficult time getting it to work initially. The WiFi "pairing" procedure did not work, especially using the built-in, local web browser. eMW had to reprogram it as well, and even after that, I had issues with the WiFi pairing procedure. Nevertheless, it has been working fine ever since reprogramming.
What I like about the RN implementation in the old JB is it supports "WPS", which can be activated with the remote key fob option using the menu driven uLCD display. My new JB does not have this option, so it does not have WPS support. I do not think WPS can be used to pair to a home WiFi network without getting deeper into the AckMe programming mode with a USB cable.
On another subject related to the CPUC PEV Sub-metering Pilot, many here, like myself, have been waiting to start soon with a UL approved (Version 12) JB. I am still on the waiting list for this program as a Northern CA PG&E customer. Once shipped, this will be my third JB and replacement for JB#2; a $10/week loaner unit from eMW.
Fwiw, I made a recent discovery that may interest some of you. In order to be fully safety approved, the new sub-metering pilot JB was designed with only a 12" long AC input cord. Such a short cord makes it much more difficult to plug in to the AC outlet mounted on the same wall as the JB. I will need a NEMA 14-50 male to female extension power cable long enough to loop down from the bottom of the JB, around and back up from beneath the outlet to plug in the power cord.
I found a suitable extension cord that is 15' long available on Amazon.com for a fairly good price on Amazon.com. http://www.amazon.com/dp/B002XL2IG8/?tag=mh0b-20&hvadid=4161146972&hvqmt=p&hvbmt=bp&hvdev=c&ref=pd_sl_5jscdkimbn_p