Network Adapter problem?

I used to very rarely see my internet connection dropping, then a week ago it started dropping 3 or 4 times a day. This evening it stopped altogether.

When this occurred I could it working again by a combination of switching the router on and off rebooting the computer and running the troubleshooter for internet connection Eventually it came up with a message 'repair as administrator or similar and that worked.This option now no longer comes up.

Other computers connected to the router are fine.

I use homeplug adapters for the affected computer and have tried replacing them at both ends. Device manager says the network adapter is working fine. I have run the troubleshooter it says the pc doesn't have a valid ip address.
 

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    PC/Desktop
    System Manufacturer/Model
    Dell Inspiron 580
    Memory
    8Gb
    Hard Drives
    120 Gb SSD for OS and 1Tb data HD
    Internet Speed
    6000
    Browser
    Microsoft Internet Explorer 11
    Antivirus
    AVG Free 2014
Is the power plan allowing the adapter, pcie or usb bus to be put to sleep or conserve power in any way?
 

My Computer

System One

  • OS
    Windows 8.1 Pro 64-bit
    Computer type
    Laptop
    System Manufacturer/Model
    Acer V3 771G-6443
    CPU
    i5-3230m
    Motherboard
    Acer VA70_HC (U3E1)
    Memory
    8GB DDR3 PC3-12800 (800 MHz)
    Graphics Card(s)
    HD4000 + GeForce GT 730M
    Sound Card
    Realtek High Definition Audio
    Monitor(s) Displays
    17" Generic PnP Display on Intel HD Graphics 4000
    Screen Resolution
    1600x900 pixels
    Hard Drives
    Samsung SSD 850 EVO 250 GB
    ADATA SSD SP900 128GB
    PSU
    90 watt brick
    Mouse
    Bluetooth
    Antivirus
    Comodo
    Other Info
    Asus RT-AC56R dual-band WRT router (Merlin firmware). Intel 7260.HMWWB.R dual-band ac wireless adapter.
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