error log:

[Sat May 05 20:24:44.208053 2018] [mpm_winnt:crit] [pid 15392:tid 312] AH02538: Child: Parent process exited abruptly. Child process is ending
Starting the Apache2a service
The Apache2a service is running.
 [core:warn] [pid 15004:tid 420] AH00098: pid file D:/phpStudy/Apache/logs/httpd.pid overwritten -- Unclean shutdown of previous Apache run?
[Sat May 05 20:24:53.659907 2018] [mpm_winnt:notice] [pid 15004:tid 420] AH00455: Apache/2.4.10 (Win64) OpenSSL/1.0.1i mod_fcgid/2.3.9 configured -- resuming normal operations
[Sat May 05 20:24:53.659907 2018] [mpm_winnt:notice] [pid 15004:tid 420] AH00456: Apache Lounge VC11 Server built: Jul 17 2014 12:58:29
[Sat May 05 20:24:53.659907 2018] [core:notice] [pid 15004:tid 420] AH00094: Command line: "D:\\phpStudy\\Apache\\bin\\httpd.exe -d D:/phpStudy/Apache"
[Sat May 05 20:24:53.660879 2018] [mpm_winnt:notice] [pid 15004:tid 420] AH00418: Parent: Created child process 6916
[Sat May 05 20:24:54.276099 2018] [mpm_winnt:notice] [pid 6916:tid 312] AH00354: Child: Starting 500 worker threads.

it is normal to open the website for the first time, but cannot access it after refreshing several times