Yes it is. 
Mondays are the busiest day of the week for our Customer Resource Center (CRC) folks.  Any Monday following a holiday will be even busier with the worse being the Monday after the 4th of July… 
Calling earlier in the day is usually better than later.  They start at 8:00 AM (central time zone) on all days except Wednesdays when they start at 8:30 AM after a 30 minute meeting.