[Android Central Question]

So my phone was experiencing the blue screen of death and to fix I formmated my phone but then afterwards when I checked hardware information about phone it showed that it had only 1gb of ram not 3gb that it originally did

[hallux]

It's possible the memory controller failed. You don't say what device or how old it is. Electronics fail, things happen.

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[Rukbat]

It could also be that a block (or a few blocks) of RAM failed too. It's not usual for electronics to fail but, as hallux said, they sometimes do. (Even new ones - that's called infant mortality, and it's why all devices are "burned in" - run for about 24-48 hours before final check out and shipping.