The WiFi on my Nexus 6p (7.1.1) keeps turning on and off repeatedly

Please help, I've got a Nexus 6p and had no problems with it but in the last month or so I haven't been able to wirelessly print to my HP printer.
Noticed when looking into why that the WiFi keeps repeating turning off and on.
Please can anyone help me with this, I'm pretty clueless on technology so please answer in the most simple way if anybody has any ideas.
Thanking you in advance.
Sandy

Mine has been doing that as well and I haven't been able to find any way to fix it. Have you?

Chris