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It sounds to me like the hardware is marginal, possibly being pushed from marginal to unstable by the hot weather.
Depending on where you are and where you bought it, you might be able to return it even though it is out of waranty. Consumer laws in many countries give you rights that are not limited to the manufacturer's waranty period.
Which firmware version was the Glo on before the upgrade to 3.3.0? The code in the 3.x.x firmware versions is more highly optimised than in the 2.x.x versions. That is generally a good thing, everything runs faster. But it can also make the CPU work harder, which like the hot weather can push marginal hardware beyond its limits.
If you can't return it, you could try manually downgrading to firmware version 2.8.1, it is slower but might be more stable on marginal hardware.
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