What's the model No. of your device? The WPS key is usually in wireless setting--Security. You can check it there.

As I know,the battery is only sold in some countries. You can contact local tp-link tech-support and ask about this information.

Hi,this is because the firmware didn't build-in your ISP information. So it will not show your ISP name. M5350v1 is an old product and discontinued now. Maybe there will be no more firmware upgrade.

Is anyone else logged in your router? I think the setting will not change by itself.

Hi,if you use 8968v4 with your friends line,is it works well? If it still restarts,I think you can contact your retailer to change another one.

Hi,there's and IPTV option in the Web UI. You can refer to the User guide and do corresponding settings. http://www.tp-link.com/res/down/doc/TD-W9970_V1_UG.pdf (Page:50-52)