That was a very common problem I started having since the beginning of the year and lasted for about 6 weeks. Then it moved over to being connected with no comms. So, DarkDenim, it seems to be your turn now. It should be sorted/moved on by somewhere in the start to middle of April.
@DarkDenim --- sorry previous post was a bit DarkHumor
I find that when I take off the yagi my router chooses another tower and, although much lower in signal, sometimes gives me higher speed. But with the yagi I cannot link to that tower. Just cannot connect nomatter where I point the antenna to.