Like the title says, When I get into the client, It says "Disconnected from chat, Attempting to reconnect..." then it fails to reconnect and has me try again. The store also shows up as just a black screen when I go to it. This has never happened to me on my playing on various accounts since mid season 3 and I have not moved residences since I started playing, so it is a bug on the end of Riot.
So I had the same chat problem, but I fixed it by playing with my IPv6 settings as recommended in this thread.
Ironically, in my case it actually involved RE-enabling IPv6 rather than disabling it like when the problem had previously appeared.
If you don't wanna click the link, here's the solution that worked for me, though again, it was re-enabling IPv6 rather than disabling it. Try both ways and see what works for you:
Start --> Control Panel --> Network and Sharing Center Under view your active connections, you'll see Access type, Homegroup and Connections. Click on your active connection (most likely labelled Local Area Connection) Click properties. You may need to provide an administrator password at this point. Under "This connection uses the following items:" tick/untick IPv6.
As for the store issue...I've had it randomly fix itself upon relogging and then breaking again on the next login...
Me too, kind of saddening I can't spend my RP after I just bought some.
I'm having the same issue. Champ select is awful because I can't tell what lanes been taken
Me to Please help Rito
Yeah
It happens every once in a while, im surprised you haven't ever experienced it. I believe this issue is server wide though.
Same problem
Disable IP Helper
Same exact issue.
Me too, It's very upsetting! Please fix this!
Have the same problem with my desktop and my sons laptop. They don't use same hardware or software. Don't go to the same sites. Since today, can't log into chat or store on either computer.
I'm so tired of everybody telling me to get better internet. Yes, in some cases my DCs and general problems are caused by my internet issues, but the ratio is like, 1 internet issue to every 7 server issues. Yes, I am kicked from games that often. Yes, I have lag spikes that often. Yes, I do know when it is my internet and when it is the servers. The stores have been down for me since about 2 days ago, but this is the first day my chat has stopped working as well. Yes, I want this fixed ASAP. I've already been into Internet Explorer to fix some weird thing in there that was wrong, and that loaded my store ONCE. rito pls :'c 
I cant seem to do either and I cant play with friends as they see me as offline and I cant get invite... I cant get into shop either... is something wrong ith the servers since some of them cant do anything like me yet some are fine and suffer no problems... plz let us know whats going on...
... so I was just sitting around playing skyrim yes I still play it :P and by golly I decide to look at my computer and there it was 8 friends online and so I went to store at that's there too...... what happened in 3 hrs 20 min
same bump
I have the smae problem as of two days ago i cant do ranked with my team or play games with my friends cause i cant get in to chat to talk or invite them, i also cant effectively play with others as i can never tell which lanes are taken right now
I got this problem too, what happen to the server?
Same.
Same
