Steam wand pressure?

Ok, so I got my Profitec Go delivered last Friday. I have made around 6-7 milk drinks. The espresso is perfect. However, I am not being able to froth milk very well. I feel the steam wand loses pressure quickly. I do two purges of 5 seconds each in 10-second intervals as recommended in the manual but still, the milk comes out with little to no froth. I have tried steaming milk in Breville Bambino and had much better result than the profitec. Am I doing something wrong? Also what size milk pitcher do you guys use to make lattes? I make two lattes in the morning for me and my husband and sometimes one in the afternoon. I would appreciate if someone could provide the product link as well.