4GB ram is the problem. Just like in computers
Luckily for us, you presented your statement in a way that allows for it to be easily restated as an hypothesis in an easily falsifiable manner:
the symptoms that we are seeing are due to the device having not enough RAM. Choices are H or Not H.
If this were true, we'd be seeing this in every device that has 4GB or less RAM. If your hypothesis is not true, then we would expect there to be devices where this isn't an issue. The latter is correct, the hypothesis is not true, Not H is correct, and therefore H is ruled out.
This is definitely not happening due to the "limitation" of having "only" 4 GB RAM.
Excellent point, I agree. It is definitely not a hardware issue. That leaves only software, given that our only two choices were hardware and software. Not H is represented by the entirety of software possibilities.
However, Not H can be further limited given that we already know what the problem is. So here's my question... why are we still inventing hypotheses when we already know the answer? That's weird.