Stuck with "observer ban" - how do I get out?

My scanner was behaving rather oddly last night and I put it down to a possible server glitch - but after it doing the same thing this morning and searching around, it seems I'm stuck with an observer ban (and I'm not the only one!)
Symptoms:
- Can't deploy resonators, they get used up but the slots never get filled
- As above, but for mods
- Can't recharge (which is a real issue since it's stopping me from maintaining my guardian)
- Forced into doing glyph hacks (not so much a problem because I glyph hack almost all the time anyway)
- XMP bursters are very, very nerfed (level 8's did about 3% damage to an unshielded level 1 resonator
- Can't pick items up
- Dropped items disappear (also hugely frustrating since I lost the portal key for my guardian by trying to give it to someone else to recharge.)
- Hacks never (or very rarely) give any items.
This is hugely frustrating, especially since I have never cheated, location spoofed, used overlays, used anything other than the official intel map, etc. Aside from emailing Niantic (already done) and hoping they get back to me quickly (unlikely looking at others' experiences), what is the best thing to do in this situation?
Best Answer
As J. Suomela writes, there are no hard facts about what, if anything, helps. I'll however relay the best conjecture I've come across:
Niantic's algorithms are trying to detect "GPS spoofing", the act of manipulating your phone's apparent location instead of actually being out and about yourself. Because of bad GPS reception or wifi hotspots with bad location data in Google's database, your personal location data aquired what the algorithm deems a signature of GPS sppofing.
The solution: Spend some time Ingress-farming away from high-rise buildings or other locations that play tricks with GPS location. Also, try to turn off the use of wifi to pinpoint location, using only GPS (a setting on your phone) After having Ingressed enough with a reliable GPS signal, you drop off the watchlist of Niantic.
Again, this is just a conjecture I came across. The user got his ban lifted, but we don't know if it was just a coincidence.
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Answer 2
I got the same answer to my query. I was really worried as I have been playing fairly for more than 2 years. I got mislead by the Sejourner badge's name as it (to me) suggested hacking the same portal every day : "Hack a portal in 24 hours period" or something. I installed ingress in an Android emulator to keep the badge going as I had to travel, and a few hours later, the hack acquired no items. I have walked more than 20 km in 2,5 days, glyph-hacking, sent a request on day 5, but apparently they send the same reply.
"We only support official Niantic Labs software. If we detect use of unofficial software that is deemed harmful to gameplay, your account may be suspended or terminated."
Hoping that it's not terminated as I just upgraded a resonator. Since the ban started have been unable to see the COMM, do not gain 99.5% of the AP, very difficult to recharge (almost impossible), but have been able to create 2 fields and capture 1 unique portal. The xmp damage is limited as someone above mentioned. The community can only suggest to keep glyph-hacking and wait.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Brett Jordan, Brett Jordan, Designecologist, Anna Tarazevich