Raspberry pi zero w 2 LED keeps flickering

[sinainos]

Expected Behaviour:

I installed pihole on a raspberry pi zero w 2 and everything worked like a charm.
I'm using the router as a DHCP to point to the pihole to resolve all DNS.
Recently, for some reason two things happen:

1. the pihole stopped filtering ads every now and then. Plus, for mobile phones on my network, it seems to work, but for my pc , it's simply doesn't work
2. the LED of the pie keeps blinking, and I need to reboot every few hours.

Actual Behaviour:

Well, everything should work smoothly...

Debug Token:

https://tricorder.pi-hole.net/86jNcXSf/

[jfb]

@sinainos

the pihole stopped filtering ads every now and then. Plus, for mobile phones on my network, it seems to work, but for my pc , it's simply doesn't work

Your DHCP server is providing Cloudflare as DNS in addition to Pi-hole, allowing some DNS traffic to bypass Pi-hole.

*** [ DIAGNOSING ]: Discovering active DHCP servers (takes 10 seconds)
   Scanning all your interfaces for DHCP servers
   Timeout: 10 seconds
   
   * Received 282 bytes from eth0:192.168.1.1
     Offered IP address: 192.168.1.59
     Server IP address: 192.168.1.1
     Relay-agent IP address: N/A
     BOOTP server: (empty)
     BOOTP file: (empty)
     DHCP options:
      Message type: DHCPOFFER (2)
      server-identifier: 192.168.1.1
      lease-time: 86400 ( 1d )
      netmask: 255.255.255.0
      router: 192.168.1.1
      dns-server: 192.168.1.59
      dns-server: 1.1.1.1
      mtu: 1500
      --- end of options ---
   
   DHCP packets received on interface eth0: 

Pi-hole should be your only DNS server.

[jfb]

@sinainos

the LED of the pie keeps blinking, and I need to reboot every few hours.

Please visit the Pi forums for this hardware question.

[wd9895]

3 Options
Power failure
SD card broken
Pi broken

And 4th. Raspi OS installed?

[sinainos]

I installed raspberry pi OS lite

[Bucking_Horn]

@sinainos

the LED of the pie keeps blinking,

This may be nothing to worry about:
RPi Zeros only have one LED, so that is used to indicate activity rather than power, i.e. 'blinking' would be its normal state of operation.

If yours would be blinking in regular intervals, it may indicate an error condition.

As jfb has suggested, you should seek further advice on this over in the Raspberry Pi forums, as that particularity is not related to Pi-hole at all.

See e.g. the RPi Foundation LED Warning Flash Codes and consider opening a topic with your flash codes at Raspberry Pi forum.