Dell Venue 11 Pro 7140 WiFi becomes disconnected during idle or waking from sleep

Question

I have a Dell Venue 11 Pro 7140 in which the wi-fi consistently becomes disconnected when either the tablet is idle for a period of time, or if it has woken from sleep. Period of time varies -- more than 5 minutes, but less than an hour.
When wi-fi connection is lost, the only way to connect again is to reboot. Not much of a solution. USB 3.0-to-Ethernet adapter is rock-solid, but there isn't much point in having a tablet if you can't be wireless at some point.
Things I've tried:
- Optimized the intel driver settings roaming agressivenes: medium-low, Throughput booster: enabled, Transmit Power: highest.
- toggling airplane mode, disabling/enabling via Network Connections
- creating a custom wireless profile
Really, not sure what I can try next. I've used other Windows 8.1 Pro laptops, and none of them have been this spotty.
If anyone has a solution out there, I'm game to try. Otherwise, I'll be returning this back to Dell as a defective product. There seems to be issues about earlier versions of the Venue 11 Pro, but I haven't been able to find much on the 7140 version.
Fully updated Windows 8.1 Pro. Using Intel dual-band Wireless AC 7265 adapter with v17.13.11.5 of the driver. BIOS version A03.

Answer 1

Hi Jennifer,                                                                                                        Saturday 4th April 2015
This whole process from order date 14th March 2015 to now has been frustrating, my mistake was to get one of the sales consultants on chat to check the saved cart, had compatible accessories for this tablet. From then on, after multiple quotes in the end he still managed to get the address wrong and missed putting screen protector on the order, multiple emails and phone calls the following week finally got address changed but couldn't get screen protector added to order in the end I ordered it over the internet. I should have cancelled order when I wanted to.
What should have been a simple process is now a nightmare the Tablet with screen protector needs to be replaced has not worked properly since unboxing and first switch on , spent many hours of installing updates, contacted technical assistance last Thursday they did a remote hookup changed some things worked for a little time.
Totally disappointed
Leigh
PS update 7th April 2015 started factory reinstall last Friday reinstalled all recomended updates more wasted time tested over weekend WiFi still not working after sleep mode. When I check for new updates keeps asking to reinstal theses 2 updates already done, reinstal them over and over still tells me to update them, second file fails to instal have to manually instal O2 Micro file searches wrong place for missing component.
"Automatic updates
These updates can be installed automatically.
Intel(R) Management Engine Components Installer View full driver details
Chipset_Driver_3TY1R_WN_10.0.31.1000_A02.EXE | Chipset (107MB) | Recommended
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O2 Micro OZ777xxx/OZ621XX memory card reader Driver View full driver details
Chipset_Driver_VPNKY_WN_3.0.8.45_A06.EXE | Chipset (16MB) | Recommended
This file will automatically self-install after downloading.Restart required "
There is something wrong with this tablet.
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