I was raiding tonight with my guild and we were working on Madness, I was getting dc'd constantly. After resetting router to rule that out, I checked bugsack/buggrabber to see if any addons were also causing the issue. Below is what was showing, I disabled WIM and next pull the dc's stopped. I don't know for sure if it was or not, it could have been a coincidence, but I felt I should post this just in case.

15x WIM/Modules/WhisperEngine.lua:354: attempt to index global 'db' (a nil value)
[string "@WIM/Modules/WhisperEngine.lua"]:354: in function filterFunc' [string "@Prat-3.0-3.9.62/services/chatsections.lua"]:49: in function <Prat-3.0/services/chatsections.lua:41> [string "@Prat-3.0-3.9.62/services/chatsections.lua"]:341: in function SplitChatMessage'
[string "@Prat-3.0-3.9.62/addon/addon.lua"]:642: in function <Prat-3.0/addon/addon.lua:616>
[string "=(tail call)"]: ?
[string "@Blizzard_ChatFrameBase/Classic/ChatFrame.lua"]:3093: in function `ChatFrame_OnEvent'
[string "*FloatingChatFrame.xml:767_OnEvent"]:1: in function <[string "*FloatingChatFrame.xml:767_OnEvent"]:1>

Locals:
frame = ChatFrame1 {
onDisplayRefreshedCallbacks =

{
}
isLayoutDirty = true
oldestFadingLineTimestamp = 13188.640000
tellTimer = 13183.149000
isDisplayDirty = true
shouldFadeAfterInactivity = true
buttonSide = "left"
checkedGMOTD = true
textIsCopyable = false
overrideFadeTimestamp = 13188.640000
fontStringPool = {
}
isScrollingMessageFrame = true
name = "General"
isUninteractable = false
minimizeButton = ChatFrame1MinimizeButton {
}
buttonFrame = ChatFrame1ButtonFrame {
}
isDocked = 1
alternativeDefaultLanguage = "Orcish"
isInitialized = 1
hasOwnFontObject = true
allowScroll = true
oldAlpha = 0
channelList = {
}
FontStringContainer = Frame {
}
messageTypeList = {
}
flashTimer = 0
timeVisibleSecs = 120
fontObject = table: 0x7fd915f8f890 {
}
zoneChannelList = {
}
insertMode = 2
defaultLanguage = "Orcish"
Background = ChatFrame1Background {
}
fadeDurationSecs = 3
ResizeButton = ChatFrame1ResizeButton {
}
visibleLines = {
}
scrollOffset = 0
historyBuffer = {
}
clickAnywhereButton = ChatFrame1ClickAnywhereButton {
}
isStaticDocked = true
ScrollToBottomButton = Button {
}
editBox = ChatFrame1EditBox {
}
isLocked = true
}
event = "CHAT_MSG_SYSTEM"
msg = "Party converted to Raid"
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = "attempt to index global 'db' (a nil value)"
WIM = {
addonTocName = "WIM"
tblInUse = {
}
modules = {
}
windows = {
}
debug = false
Menu = WIM3Menu {
}
lastState = "raid"
lists = {
}
useProtocol2 = true
ctxMenu = {
}
constants = {
}
L = {
}
O = {
}
S = {
}
isModernApi = false
env = {
}
tblAvailable = {
}
curState = "raid"
nextColor = {
}
db_defaults = {
}
armoryLinks = {
}
WindowParent = WIM_UIParent {
}
options = {
}
Notifications = {
}
beta = false
libs = {
}
stats = {
}
windowsByAge = {
}
version = "3.12.9"
}
CMS_PATTERNS = {
FRIEND_OFFLINE = "(.+) has gone offline."
PLAYER_NOT_FOUND = "No player named '(.+)' is currently playing."
CHAT_IGNORED = "(.+) is ignoring you."
FRIEND_ONLINE = "|Hplayer:(.+)|h%[(.+)%]|h has come online."
}
string = {
}
Windows = {
}
_G = {
ContainerFrame5Item7 = ContainerFrame5Item7 {
}
DH_HAVOC_CORE_ABILITY_2 = "Strong melee attack that consumes Fury. If it critical strikes, some Fury is refunded."
PlayerTalentFramePanel3Arrow23 = PlayerTalentFramePanel3Arrow23 {
}
UNIT_NAMES_COMBATLOG_TOOLTIP = "Color unit names."
LE_GAME_ERR_CHAT_RAID_RESTRICTED_TRIAL = 798
SPELL_FAILED_CUSTOM_ERROR_71 = "This partygoer wants to dance with you."
LE_GAME_ERR_PET_SPELL_TARGETS_DEAD = 413
ContainerFrame3Item24SubIconTexture = ContainerFrame3Item24SubIconTexture {
}
MultiBarLeftButton7 = MultiBarLeftButton7 {
}
BGRLiveItemButton223 = BGRLiveItemButton223 {
}
LE_GAME_ERR_INVALID_FOLLOW_PVP_COMBAT = 365
MerchantItem4AltCurrencyFrameItem1Text = MerchantItem4AltCurrencyFrameItem1Text {
}
OPTION_SHOW_ACTION_BAR5_TOOLTIP = "Attached to the left side of Action Bar 4 by default"
BINDING_NAME_NAMEPLATES = "Show Enemy Name Plates"
CHAT_HEADER_SUFFIX = ": "
MultiBarBottomRightButton8Shine5 = MultiBarBottomRightButton8Shine5 {
}
VuhDoNewOptionsColorsHotsHotsPanelHot2RadiGroupFlashCheckButtonTextureCheckMarkTexture = VuhDoNewOptionsColorsHotsHotsPanelHot2RadiGroupFlashCheckButtonTextureCheckMarkTexture {
}
VuhDoNewOptionsToolsResetMiscPanelLangueageButton = VuhDoNewOptionsToolsResetMiscPanelLangueageButton {
}
DUNGEON_FLOOR_UPPERBLACKROCKSPIRE3 = "Hall of Blackhand"
BGRLiveItemButton317IconTexture = BGRLiveItemButton317IconTexture {
}
PlayerTalentFramePanel3Talent25 = PlayerTalentFramePanel3Talen