Not good... How long have you had it and was it new?
Few things to try:
- ensure all software is up-to-date
- clear cache partition (YT, Google or search here how to do it)
- failing all that, a full reset is the penultimate last resort before
- asking for a replacement (but hopefully it doesn't need to get to this)
My experience seems to be phones get particularly warm in the first few weeks but settle, but also heat isn't always bad as they are designed to move heat away from the processor and disperse.
With that said, crashing and freezing is clearly not what's supposed to happen.
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