1991 Toyota 4Runner Do I need a new radiator?

Engine Cooling problem
1991 Toyota 4Runner 6 cyl Four Wheel Drive Manual

I have a 4runner with about 180,000 miles on it. And recently when I have been driving my top radiator return hose will come off the radiator, and of course losing all my coolant. But the hose did not break or I can't see any coolant leaking from the radiator. This has happened 3 times with about a month in between. I had water and coolant on me so I put the hose back on and refilled. Then it would drive just fine. I don't know if the problem is in the radiator or the thermostat? I don't get a high temperature reading on the dash or anything like that. I will drive fine and then all of a sudden the hose will blow off and loose all the coolant. Does this mean that I need a new radiator?

Thanks for the help and anyone with any ideas let me know.