It think this is not a problem with the routers. I experimented with 3 routers (HG520c, HG531V1, Linksys-Cisco WAG160N) and with each appears this annoying bug.. Especially getting on my nerves it is now that stupid message renamed!!!
Please read all messages in this topic! Unfortunatelly, problem with "out of memory. app is closed" is just renamed to "this app will close to free up more memory" so, NOT SOLVED! After a while this message will appear and solution is to reboot TV set..