Read the statement by Michael Teeuw here.
MM Nightly Reboot Needed, PM2 ?
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 @Mykle1 I did but since i didnt have the Edit /etc/modprobe.d/8192cu.conf file, I’m running an rPI3b so I did the wireless-power off step bu it didnt seem to help or the problem is outside the raspberry. I just found how to do a nightly reboot using crontab. 
 https://www.raspberrypi.org/forums/viewtopic.php?f=91&t=126106
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 @cohron said in MM Nightly Reboot Needed, PM2 ?: I just found how to do a nightly reboot using crontab. That worked for me and I have Pi3 b as well. Glad you found the script you were looking for. Good luck! 
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 @Mykle1 curious, did you have the /etc/modprobe.d/8192cu.conf file already or did you create it? i just created it, just in case that does the trick too. thanks again. 
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 @cohron said in MM Nightly Reboot Needed, PM2 ?: @Mykle1 curious, did you have the /etc/modprobe.d/8192cu.conf file already or did you create it? i just created it, just in case that does the trick too. 
 thanks again.As it turns out, I do NOT have the 8192cu.conf file are all. 
 pi@Pi3:/etc/modprobe.d $ ls
 fbdev-blacklist.conf ipv6.conf libpisock9.conf raspi-blacklist.conf
 pi@Pi3:/etc/modprobe.d $
 `
 However, looking at the instructions again, it says:For Raspberry Pi 3 
 Edit /etc/network/interfacessudo nano /etc/network/interfaces 
 Add the following line under the wlan0 sectionwireless-power off 
 Reboot your PIsudo reboot It’s been some time since I set up my Pi but it’s obvious that I only did this portion of the instruction 
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 I was curious so I checked my /etc/network/interfaces file. It would appear I don’t have the edit we’re talking about, yet my wifi never drops. Here is the file: interfaces(5) file used by ifup(8) and ifdown(8)Please note that this file is written to be used with dhcpcdFor static IP, consult /etc/dhcpcd.conf and ‘man dhcpcd.conf’Include files from /etc/network/interfaces.d:source-directory /etc/network/interfaces.d auto lo 
 iface lo inet loopbackiface eth0 inet dhcp auto wlan0 
 allow-hotplug wlan0
 iface wlan0 inet dhcp
 wireless-essid XE1S3
 wireless-key 5BBXXXXXX

