There could be power issues in the area, a "brownout", some devices may be able to handle the low voltages better than other.
If it is a brownout, it is best not to use expensive appliances until you are confident general power issues are resolved.
Most people are familiar with the disruptive nature of blackouts and how they can wreak havoc on businesses, leading to prolonged power loss and often costly damages for those who are unprepared or ill-equipped to handle them. But many people aren’t as familiar with their seemingly-less-severe...
nationalstandby.com
en.wikipedia.org