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This simply smacks of a hardware problem, as Toshiba normally designs a decent screen.
To do your own shielding or EMI mitigation is going to take a lot of work. Batteries are not a source of EMI as a general rule, as they do not pull out any pulse. (Power supplies are often problems, because they are fed by 60 cycles AC power.)
My guess is that the PCBA is laid out poorly and is radiating into itself.
Given enough desire and resources, a firmware patch may be able to fix this in the future. But they'd need to experiment around with the values for the SOC and other parts of the operating system.
I'll be interesting if any fixes are found in the future.
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