CobraKing wrote:
^^^
Forgot to ask but can you try resetting the OSSC to default settings, just choose the Line Options (2x, 3x, etc...) and try to get a stable image before doing any tweaking?
Can you also enable the DTV (or similar) switch under Sampling Option category?
Thanks for the suggestions! Resetting the OSSC is something I can try, but since this is my second one and it's behaving just like my old one I exchanged I am somewhat doubting it will do much I'm afraid.

It is set to DTV already. I've also tried with the other options, but it also drops then.
Kez wrote:
Have you experimented much with your TV settings? Firmware updates? Factory reset? Tried different inputs? Have you tried another TV?
Also what about the PSU on the OSSC? Did you replace that as well when you got a new one?
I have experimented with my TV's settings quite much yes. But so far nothing I changed has made it more or less stable.
My TV should be up to date with the latest firmware. I can try a factory reset on my TV - at this point I'll try anything!
I also tried different inputs yes, and none work better than the other.
I tried to run my OSSC to a PC monitor and though I might need to experiment with it a bit longer, I didn't notice any drops during my testing.
Yes, we actually exchanged the PSU as well, Matt had the idea to replace the PSU just in case as well since it could've been the issue. Which I thought was a good idea to try. But since the issue has persisted, then I somewhat doubt it's the PSU which is at fault. Especially since 240p content works flawlessly.
NormalFish wrote:
Is it the OSSC losing signal? (light turns off/turns red on the device) or is it just your TV? Don't see this in your posts but maybe I'm missing it. This is pretty key to diagnosing the issue since depending on the answer, things to try are totally different.
I believe I noticed that the light blinked red once or twice, but it has been very rare. But yes, I've noticed it. Once when I was playing Halo on my OG Xbox it even lost signal fully (if I remember correctly!). However, I don't think I've ever noticed that the light has ever turned red when I've played on my Dreamcast or other consoles other than the Xbox. Since it's such a fringe case, I am not even sure that it counts. I am almost wondering if it's something with the TV. But I would also find that odd, since the LG OLED series seems to be a very compatible in general with the OSSC. Matt form VGP has the same model and apparently 480p works flawlessly for him.