I've been having the same problem as you and others for quite sometime now with data drops and it showing 4g lte but nothing loading. Im on 4.3 MI7 though, did a lil research and someone said to add a new apn and change it to IPv4 instead of IPv6 and it should help. Made the change and I havent had a single data drop yet in 2 days and I usally already have like 5 and having to toggle data and airplane mode to get it back. Might be too early to know for sure but it wouldnt wouldn't hurt to try and see. You need to turn off your data, go to more networks, mobile networks, access point names and create a new apn then save it and select it. Add only whats checked marked in red. Hope this helps...
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