RAC & Failsafe :: Database Time Spent Waiting Warning

i'm keep on getting below error every morning in my Database.this indicate in Grid control every morning.

Metrics "Database Time Spent Waiting (%)" is at 34.336 for event class "Concurrency"
Metrics "Database Time Spent Waiting (%)" is at 100 for event class "Other"
Metrics "Database Time Spent Waiting (%)" is at 44.78 for event class "Other"

i need to know, this is something that i should consider as a critical warning and how can i solve this .