Working fine for me. I am in Keller, I just did a Verizon speed test to the server in Carrollton:
I have 25/25 service. I also did several Speedtest.net tests to a couple of different servers, in Keller and Dallas, the results were pretty much the same as the Verizon test.
Assuming you are in a single family residence, have you tried resetting the ONT? Can't hurt, might help. Are you connected via coax for internet or do you have ethernet? If coax, maybe check the coax connections from the ONT to the splitter and from there to the router. Do you have TV service? If so, any reception problems on some or all channels? If so, that could sort of confirm a coax connection problem.
Of course it could be something in the Central Office, but in that case I think other users in your neighborhood would probably be experiencing the same problem; have you checked with any of your neighbors?
Other than the above, sorry, I have no ideas, I have never experienced what you are seeing in my 8 years with FiOS. Good luck!
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Justin
FiOS TV, 25/25 Internet, and Digital Voice user
QIP7232, QIP7100-P2, IMG 1.9.4
Keller, TX 76248 (VHO 1)