Other way around. Plasmas are unstable. Pretty much any time you dump energy into them, they get all whacked out on a small scale. This specific mode of instability on the sun wasn't expected, and it might even be a totally new instability mode, but speaking generally "plasmas behaving badly when you pump energy into them" has been a bug for fusion research for a very long time. You want the energy to be smoothly stable in the plasma not some whacked out thing because whacked out things tend to locally adsorb the energy from a big region, concentrate it in a little area getting hotter and hotter, which exceeds and breaks containment in its local area, end result is the plasma energy gets dumped into the diverter (or worst case, wall).
Crappy cooking analogy is when you're melting chocolate and the chocolate instead of being smooth thru the entire bowl suddenly phase transitions (more or less) and siezes into
Crappy
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/tj5Ock_VWyE/story01.htm
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