2 Faulty lights out of the 4

I bought a set of 4 with a plan to buy 8 more for my pool area. When I got the lights, I let them charge for 2 days under Florida sun. I installed the lights by the pool with same sun exposure. I turned all for lights on using mode 2 (Dim + motion). The first night all 4 lights came on and they looked beautiful. However, two of the lights went out after ½ an hour in Dim mode (no motion was applied), while the other 2 stayed on in Dim mode for about 4 hours. I changed the location of the two lights, let them charge and the same thing happened. Now after 3 nights, I feel that the two faulty lights have an issue. Now I put the purchase of the additional 8 on hold pending the resolution of the issue

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