Weird error code

[pandairo]

The past few days (since ps4 2.00/vita 3.35) my Vita has had problems receiving messages and viewing my friend list, in that it's either really slow to load or just times out.

Today however, my Vita is giving me this message: "Could not connect to the server. It has been accessed too frequently by you, so access is being restricted. Please try again later. (NS-16116-5)"

I've googled the code but it returns nothing of use.

 

Anyone having a similar problem since the updates, or should i investigate further by contacting Sony?