Zoho DESK slow from 14:55 - 15:15

ZOHO desk is slow everyday from 14:55 to 15:15, this is everything from creating a new ticket, performing a blueprint transaction, or sending emails.

I have asked our internal IT team to checkout anything that could cause slowness on our machines or within our infrastructure but all points to Zoho Desk itself with how its hosted.

Any idea on what we can do?