[Galaxy Tab 7.7 General] apchoo:
I bought a SGT7.7 32GB P6810 tablet 2 weeks ago and initially had loads of wifi issues. I managed to resolve the wifi issues, to be replaced with SOD issues. I sent the tablet back to the retailer yesterday for replacement. Hopefully I'll get a better/new one.

My setup was as follows.

A D-Link DIR-655 wireless router initially configured to support both WPA & WPA2 Personal security and both TKIP (WPA) & AES (WPA2) encryption methods. Existing wireless devices were iPhone3GS, iPad2, Samsung Galaxy S2, Wii and Canon MP640 printer. I had no problems with wireless networking with these devices.

When I got my SGT7.7 (stock Samsung software running Honeycomb 3.2), I would lose wifi connectivity every 2-3mins even though the wifi icon at the bottom righthand corner showed connectivity and the upload/download arrows beside it were lit. But I would get "No Connection" if I was browsing, etc., and it would be approx. 30s before I get wifi connectivity again. After 2-3mins, the cycle repeats itself.

Thru trial and error, I found that if I set the DIR-655 wifi security to just WPA Personal with TKIP, the wifi dropouts disappeared. Solid network oonnectivity as long as my SGT7.7 is within wifi range. Now with Android Honeycomb 3.2, you cannot explicitly set wifi security to WPA or WPA2; there is only one option that supports both. I suspect that every few minutes, the SGT7.7 got its knickers into a knot with its wifi security negotiation and handshaking. Locking down my DIR-655 to one specific protocol seemed to have fixed my connectivity problem. I suspect if I had set my router security to WPA2+AES it would have worked as well.

When all was good, the 2nd problem reared its ugly head. I was getting the SOD! There wasn't any pattern to my SODs. In the morning, sometimes I would have no probs waking up the tablet and other times I had to do a hard reboot. Most times when it goes into standby mode (my screen timeout is 2mins), it would refused to wake up. I've done about 10 factory resets with and without restoring from google. I've left it on the default mode without installing a single new app and I would get SOD. The only way it would wake up successfully every time was if I switched off wifi (either explicitly or enabling flight mode). However, I'd have to remember to disable wifi every time after using the tablet which a) is very annoying, and b) would disable email/FB/gmail notifications when there was no internet connection. I even extended the screen sleep time to 5mins to give myself ample time to remember to turn off the wifi.

As both issues above appeared to be wifi related, I came to the conclusion that my SGT7.7 had a (wifi) hardware fault, so I got an RMA from the retailer and sent it back yesterday for a replacement.

A pity I hadn't read this forum thread before then. When I first got my tablet, I popped in a spare Sandisk 4GB Class 2 microSDHC card. When I had the wifi connectivity I had no SODs that I could remember. A week later I bought a new Kingston 32GB Class 10 microSDHC card which came pre-formatted in FAT32. I did NOT reformat it in the tablet---I just copied my ebook & video files to it on my PC and popped it into the tablet. Thinking back, that was probably when the SODs started :o( . So are we saying that a higher capacity and/or a particular brand of microSD card may be the cause of SODs?