[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] hedpe:
I've seen several people now post about the Wifi issue and some people suggest it might be a problem with their phone. I'm pretty sure it's not a hardware issue and its some problem with the driver. I ran an older version of CM10 and had absolutely no issues, then I recently upgraded and I'm constantly getting Wifi drops. In checking the dmesg output, the driver is definitely crashing:

<6>[18269.656216] CFG80211-INFO2) wl_cfg80211_hang : In : chip crash eventing
<3>[18269.656216] BUG: sleeping function called from invalid context at mm/slub.c:912
<3>[18269.656338] in_atomic(): 1, irqs_disabled(): 0, pid: 26584, name: .android.chrome
<4>[18269.656491] [<c010d550>] (unwind_backtrace+0x0/0xec) from [<c07fe9d8>] (dump_stack+0x20/0x24)
<4>[18269.656491] [<c07fe9d8>] (dump_stack+0x20/0x24) from [<c0165b0c>] (__might_sleep+0x110/0x130)
<4>[18269.656521] [<c0165b0c>] (__might_sleep+0x110/0x130) from [<c022050c>] (__kmalloc+0x8c/0x230)
<4>[18269.656613] [<c022050c>] (__kmalloc+0x8c/0x230) from [<bf02257c>] (cfg80211_disconnected+0x44/0xb4 [cfg80211])
<4>[18269.656796] [<bf02257c>] (cfg80211_disconnected+0x44/0xb4 [cfg80211]) from [<bf1548f0>] (wl_cfg80211_hang+0x68/0x98 [dhd])
<4>[18269.656887] [<bf1548f0>] (wl_cfg80211_hang+0x68/0x98 [dhd]) from [<bf12624c>] (net_os_send_hang_message+0x3c/0x48 [dhd])
<4>[18269.656979] [<bf12624c>] (net_os_send_hang_message+0x3c/0x48 [dhd]) from [<bf1288ec>] (dhd_start_xmit+0xdc/0x2a4 [dhd])
<4>[18269.657040] [<bf1288ec>] (dhd_start_xmit+0xdc/0x2a4 [dhd]) from [<c069fbac>] (dev_hard_start_xmit+0x42c/0x6ac)
<4>[18269.657070] [<c069fbac>] (dev_hard_start_xmit+0x42c/0x6ac) from [<c06b61a8>] (sch_direct_xmit+0x78/0x1dc)
<4>[18269.657101] [<c06b61a8>] (sch_direct_xmit+0x78/0x1dc) from [<c06a0288>] (dev_queue_xmit+0x45c/0x6a4)
<4>[18269.657131] [<c06a0288>] (dev_queue_xmit+0x45c/0x6a4) from [<c06f8958>] (ip_finish_output+0x350/0x39c)
<4>[18269.657131] [<c06f8958>] (ip_finish_output+0x350/0x39c) from [<c06f947c>] (ip_output+0x134/0x14c)
<4>[18269.657162] [<c06f947c>] (ip_output+0x134/0x14c) from [<c06f8b50>] (ip_local_out+0x38/0x3c)
<4>[18269.657193] [<c06f8b50>] (ip_local_out+0x38/0x3c) from [<c06f8e18>] (ip_queue_xmit+0x2c4/0x390)
<4>[18269.657193] [<c06f8e18>] (ip_queue_xmit+0x2c4/0x390) from [<c070db28>] (tcp_transmit_skb+0x7f0/0x840)
<4>[18269.657223] [<c070db28>] (tcp_transmit_skb+0x7f0/0x840) from [<c070e874>] (tcp_write_xmit+0x840/0x944)
<4>[18269.657254] [<c070e874>] (tcp_write_xmit+0x840/0x944) from [<c070ea00>] (__tcp_push_pending_frames+0x38/0x98)
<4>[18269.657254] [<c070ea00>] (__tcp_push_pending_frames+0x38/0x98) from [<c0701a28>] (tcp_sendmsg+0x9c4/0xb30)
<4>[18269.657284] [<c0701a28>] (tcp_sendmsg+0x9c4/0xb30) from [<c07219dc>] (inet_sendmsg+0xb8/0xc8)
<4>[18269.657315] [<c07219dc>] (inet_sendmsg+0xb8/0xc8) from [<c068a2d0>] (sock_aio_write+0x130/0x148)
<4>[18269.657315] [<c068a2d0>] (sock_aio_write+0x130/0x148) from [<c0225870>] (do_sync_write+0xa4/0xe4)
<4>[18269.657345] [<c0225870>] (do_sync_write+0xa4/0xe4) from [<c0225fdc>] (vfs_write+0xcc/0x140)
<4>[18269.657376] [<c0225fdc>] (vfs_write+0xcc/0x140) from [<c0226250>] (sys_write+0x4c/0x78)
<4>[18269.657376] [<c0226250>] (sys_write+0x4c/0x78) from [<c0105e00>] (ret_fast_syscall+0x0/0x30)

I will see if I can do some digging around on it