These scrolling/freezing/black video issues seem to be more and more common, I guess more flight hours the higher likelihood that eventually something will fail.
It could be one of the 3 HDMI connections, it could be the cable, gimbal or GoPro HDMI port. In my case all of these video feed issues always came down to the HDMI cable (or its connections).
Since February I went through 2 stock HDMI cables and 4 flat ribbon cables, but I've been flying almost every day (5 batteries a day).
When my original HDMI failed, I ordered new one from 3DR but they took forever to ship it so I've ordered 2 flat ribbon cables, first one lasted me only a week, second one lasted only a day.
I ordered 2 more ribbon cables and sent the 2 faulty ones for replacement, so then I received 4 new ribbon cables and in the meantime I finally also received the replacement stock HDMI cable from 3DR.
I installed the stock HDMI cable and this one lasted the longest, about 2 months which is relatively long in flight hours considering I was flying almost every day. I went away for a trip and brought with me 2 ribbon cables just in case. When the stock cable failed I ordered another one from 3DR but that's now 5 weeks ago, they are still out of stock. I installed another of those ribbon cables and I guess I had same experience as
@pyrate (it failed on install), so then I installed my last ribbon cable and again it lasted only a day.
When diagnosing faulty HDMI cable, first I remove gimbal and connect HDMI cable directly to GoPro and also check for HDMI connection to the main board, if still not working then I remove the cable and connect it directly between GoPro and TV/monitor, if still not working then I throw it away.
It's hard to exactly pin-point where the issue is, on few occasions it was just bad/loose connection either at the gimbal end or at the main board end, in which case after re-install it would work for a while and then the problem re-appears again. When my 2nd stock HDMI cable failed first time and I tested it directly between GoPro and TV it still worked, so I put it back in but I made HDMI connections tighter (I squeezed the female connector on the gimbal as well on the main board with long nose pliers before inserting the male connectors on the cable), this gave me extra week or two but eventually HDMI cable failed completely anyway.
It's been now 5-6 weeks that I'm waiting for new stock cable from 3DR and only have minimum use of the Solo, you can still do Follow me even when flying blind because camera is always pointing at you but it's nerve wrecking since you have no live feed and no idea how high/low Solo is flying as the terrain changes, you really only do it when Solo is ahead of you and you have it LOS. Other than that you can't do much without live feed, some simple 2-point MPCC with camera in fixed position.
While waiting for 3DR to send me another replacement cable, as a last resort I ordered 2 other ribbon cables, this time from Aerial Pixels, one was supposed to be with straight ends (but unlike relish3D cable I meant to order one where one end is not upside down from the other (if you know what I mean - when one end connector is upside down then you need to twist the cable somewhere during the install, I don't like that, it mangles and folds the cable once you reinstall the gimbal), unfortunately AerialPixels sent me that cable exactly how I didn't want it, anyway I had another cable on order - one end straight and the other in right angle and this one I installed yesterday, cable length is same as relish3D, connectors seem to be same make, but the cable itself looks different material. I have also put little bit of SuperX glue on the mainboard connection and I'm hoping this will last at least until I receive the new stock cable from 3DR.
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