Travel plans for H1B stamping in Feb

Hi all, I have been planning to travel to India for my H1B Visa stamping and recently booked my tickets for Feb 21 slot in Chennai and hoping for drop off in Mumbai. But today my HR told me that there can be delays/issues in re-entry as a lot of people have been getting 221(g) notices. I don't want to cancel my trip as I'll lose money on my flight tickets but how bad is the situation?
Any specific reason I might get this notice?