Please have patience with a newbie.  This does not feel specific to Octavia III (2013 1.2T S), but I can't see anywhere else to post it.   Earlier this week, my Bolero Infotainment unit suddenly started to hit problems.  It had previously worked fine for the previous 3.5 years I have owned the Octavia.  As soon as I switched the Power button on, it would turn itself on again within 3 seconds.  After that it might not respond to pressing the Power button again, unless I held it down for