It would be helpful when you ask for help if the following were provided:
Is Tablo 2 channel or 4 channel
Tablo firmware
device using to watch Tablo
version of Tablo app
model of router
wired or wireless for Tablo
wired or wireless for device
if wireless for either of above, 2.4 or 5 wireless
EDIT: Just thought of a couple of others:
firmware in router
hard disk you have
how much empty space on hard disk
Do you have auto delete checked in settings
Is disable fast start live tv checked
Antenna
have you looked at www.tvfool.com to aim your antenna
I think that about covers everything that would make troubleshooting easier. If anyone thinks of additional information, please reply and add it.