AT&T was dealt its heaviest video subscriber blow to date, incurring a net loss of 297,000 in Q3 – spearheaded by 359,000 satellite customer exits, compared to satellite losses of 286,000 in the previous quarter and 251,000 in the same period last year. But while DirecTV Now has served as a sufficient net video subscriber off-setting tool thus far, albeit not consistently, sign ups to the OTT video service all but ground to a halt in the last quarter. Picking up just 49,000 subscribers, almost 300,000 less than in the second quarter of 2018, is a direct result of the $5 price hike implemented on DirecTV Now at the start of August. That means the slowdown won’t be a particularly…