@zilladog A bit late on the subject here but I currently use a Xperia X on T-Mobile and everything seems to work for me pretty well. Occasionally a SMS or MMS will fail to come through but I had the same issue on my Nexus 5. That said I haven't had any deal breaker issues thus far and I daily drive it.

I've had this same issue for a while now. Extremely irritating to have to constantly reboot to get wifi back but have to deal with it I suppose.

@mjosenhans I named my network personally so unfortunately that's not the issue. It just seems on random startups the wifi indicator won't show anything at all. Have to reboot and then detects and connects normally.