I can play Multiplayer,but i can't play garden ops.

Are you able to create your own Garden Ops sessions? What do your NAT settings look like?

Garden Ops is peer hosted, so if the person you're connecting to has a poor connection, all clients may experience trouble connecting or latency issues.

yes,i can create a new garden ops session,but can't join to play with others.

i try many times,but unsuccessful.

What do your NAT settings look like? Do you have the required PSN Ports forwarded?

You can find some general guide line how to set it up here: http://manuals.playstation.net/document/en/ps4/settings/nw_test.html#ID39017

I'm having the same prob. Multiplayer is great but I haven't been able to play a single Garden Op in coop. I've done one solo round though. 

I have 35mb down 10 up Nat 2. I couldnt join a pub G. Op. and when i created one, my friends couldnt join either. Or theyd join only to be kicked out when i started the game. 

My Nat is tpye2,when i don't used the router to connect my ps4,i can join into the game.

but when i was used the router to connect the ps4,i can't join it.

but i alreally reset my router and the upnp is opened.

Same problem here. Connection lost after a few seconds in lobby. Sometimes I host a game and play alone and wait for other players. But then the connection gets lost, too. Annoying.

NAT is open, no problems with other host migrated games.

Have the same problem with garden ops. Multiplayer is fine and lag free.
Sometimes i cant join a garden ops and when i do get one its laggy as hell.

EA, Fix this **bleep** already! Can't play Garden Ops, NAT TYPE 2 and 41 mbps download and 10 mbps upload! It's not us, It's you!