I am having a problem with the Sentry Key Light. for my 2000 Jeep Grand...

...Cherokee.....? I am having a problem with the Sentry Key Light. When I am driving, after about 10 minutes, the Sentry Key Light comes on, it stays solid and then after a few minutes all of the gages go down and all of the dash lights come on. If I turn off the car and power it up again, the problem will be fixed for a bit, but will come back on later and the same problem will occur. Recently, I had to have my PCM replaced so it is brand new. Someone has said that it could be a possible Dash Cluster problem? I'm not sure ... Please help. And I tried having everything reset, the light was off for a whole day and then came back on the next morning while driving.