Radio interference may have been part of the problem (laptops or cell phones turned on) - but it would be notoriously difficult to prove. Much lab time and effort is currently being spent in trying to correlate cell phones and lap top WiFi technology with brain cancers - but with no measurable success to date. The BioElectroMagnetics Society in the USA have yet to report any reproducable positive effects - though there have been a number of “one off” reports that defy duplication.
The sceptics bottom line is that if it can’t be reproduced then it didn’t happen. Or did it?