It is known, that Reissner-Nordstrom black hole is thermodynamically unstable .
- Does it mean, that there is no Reissner-Nordstrom black hole in physical world?
- Does it mean, that there may be phase transition?
- Does it mean, that it can be stable for enough long time?
 For example, arxiv.org/pdf/0812.1767v2.pdf pp.19-20.