Since I downgraded the R7000 router firmware to 1.0.4_30 a couple weeks ago, I have had no further lock-up issues with Tablo. Thanks again @Mark1 and @Warunicorn. And thanks @dejarjd for filing ticket.
Just a comment for people with the Netgear R7000. I replaced the stock firmware with AdvancedTomato after experiencing multiple issues (I currently have V3.1-132 from https://advancedtomato.com/downloads/router/r7000) and now have much better stability and functionality overall.
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