My Dell XPS 8700 (Win 7) suddenly began putting itself to sleep at 6pm daily, even if I'm typing. I don't know what caused this to occur, except possibly a windows update that took place in the middle of the night. I initially went into settings for power and saw 2 plans set up, one from Dell and the other window's Power saver plan. I set both to never for sleep and hibernate yet it still occurred. I have current drivers and a fairly new UPS that has software to set to shutdown only after power loss.

Dell is of little help, can anyone point me in the right direction?

I did do the powerdfg -energy program and came up with this:

Power Efficiency Diagnostics Report

Scan Time   2014-05-08T19:21:48Z
Scan Duration   60 seconds
System Manufacturer     Dell Inc.
System Product Name     XPS 8700
BIOS Date   08/23/2013
BIOS Version    A04
OS Build    7601
Platform Role   PlatformRoleDesktop
Plugged In  true
Process Count   115
Thread Count    1631
Report GUID     {097caf99-039b-44c3-b154-d797bfbfdfcc}
Analysis Results
Errors
Power Policy:Sleep timeout is disabled (Plugged In)
The computer is not configured to automatically sleep after a period of inactivity.
System Availability Requests:System Required Request
The device or driver has made a request to prevent the system from automatically entering sleep.
Requesting Driver Instance  HDAUDIO\FUNC_01&VEN_10EC&DEV_0899&SUBSYS_102805B7&REV_1000\4&220b1bbc&0&0001
Requesting Driver Device    Realtek High Definition Audio
CPU Utilization:Processor utilization is high
The average processor utilization during the trace was high. The system will consume less power when the average processor utilization is very low. Review processor utilization for individual processes to determine which applications and services contribute the most to total processor utilization.
Average Utilization (%)     9.48
Warnings
Platform Timer Resolution:Platform Timer Resolution
The default platform timer resolution is 15.6ms (15625000ns) and should be used whenever the system is idle. If the timer resolution is increased, processor power management technologies may not be effective. The timer resolution may be increased due to multimedia playback or graphical animations.
Current Timer Resolution (100ns units)  10000
Maximum Timer Period (100ns units)  156001
Platform Timer Resolution:Outstanding Kernel Timer Request
A kernel component or device driver has requested a timer resolution smaller than the platform maximum timer resolution.
Requested Period    10000
Request Count   2
Platform Timer Resolution:Outstanding Timer Request
A program or service has requested a timer resolution smaller than the platform maximum timer resolution.
Requested Period    10000
Requesting Process ID   8672
Requesting Process Path     \Device\HarddiskVolume3\Program Files (x86)\Mozilla Firefox\firefox.exe
Platform Timer Resolution:Outstanding Timer Request
A program or service has requested a timer resolution smaller than the platform maximum timer resolution.
Requested Period    100000
Requesting Process ID   1212
Requesting Process Path     \Device\HarddiskVolume3\Windows\System32\svchost.exe
Power Policy:802.11 Radio Power Policy is Maximum Performance (Plugged In)
The current power policy for 802.11-compatible wireless network adapters is not configured to use low-power modes.
CPU Utilization:Individual process with significant processor utilization.
This process is responsible for a significant portion of the total processor utilization recorded during the trace.
Process Name    audiodg.exe
PID     1304
Average Utilization (%)     4.73
Module  Average Module Utilization (%)
\Device\HarddiskVolume3\Windows\System32\msvcrt.dll     1.88
\Device\HarddiskVolume3\Windows\System32\MaxxAudioAPO5064.dll   1.77
\Device\HarddiskVolume3\Windows\System32\AudioEng.dll   0.80
CPU Utilization:Individual process with significant processor utilization.
This process is responsible for a significant portion of the total processor utilization recorded during the trace.
Process Name    thunderbird.exe
PID     6036
Average Utilization (%)     0.35
Module  Average Module Utilization (%)
\Device\HarddiskVolume3\Program Files (x86)\Mozilla Thunderbird\xul.dll     0.16
\Device\HarddiskVolume3\Program Files (x86)\Mozilla Thunderbird\mozjs.dll   0.05
\SystemRoot\System32\win32k.sys     0.03
CPU Utilization:Individual process with significant processor utilization.
This process is responsible for a significant portion of the total processor utilization recorded during the trace.
Process Name    dwm.exe
PID     1340
Average Utilization (%)     0.25
Module  Average Module Utilization (%)
\Device\HarddiskVolume3\Windows\System32\dwmcore.dll    0.08
\Device\HarddiskVolume3\Windows\System32\nvwgf2umx.dll  0.05
\SystemRoot\system32\ntoskrnl.exe   0.03
CPU Utilization:Individual process with significant processor utilization.
This process is responsible for a significant portion of the total processor utilization recorded during the trace.