Hi Ricardo
I have seen this when underlying storage changed from raw SAN devices to NAS file system devices.
tempdb writes after a certain amount of volume queued up in a serial way choking the whole server.
This may or may not be what is happening on your server.
Having said that : If this is not something new then what was the last change in your case ?
Especially related to storage
Wait event 29 is related to storage and I/O.
Avinash
