Random crashes and reboots (boot loops) are usually attributed to memory problems like when the internal memory of the phone is shrinking. They often occur among other performance issues such as lags and freezes that usually transpire as wear-and-tear symptoms in early devices. However, there are some factors that can trigger the same symptoms to
Sudden un-triggered reboots on an iPhone apparently denote a problem that needs immediate fixing. Such symptoms usually depict system instability as you aren’t certain if you could get a task done without any interruption. Generally, automatic restarts in electronic devices, particularly computers and mobile devices are often attributed to hardware failure or system instability. The
Random restarts often occur when a device gets old or running low on storage. It can also be triggered by some malwares and system bugs. If the underlying cause isn’t that too complex, then the transpiring symptoms will just be minor and therefore easily remedied by standard procedures. Otherwise, more advanced solutions would be necessary.