1. Have you got a 5 volt regulated supply?
2. Have you tied all 9_set and 0_set pins low. Pins 2, 3, 6 & 7.
If you let more than one of each float high it will lock the counter.
3. Which clock are you using as the input from the NE555.
4. Have you tied the output of that counter to the other clock input?
We are not long range mind readers.
Please provide a link to your circuit or;
Draw your circuit diagram and drag it onto your next post.
It may work on 4.1V sometimes, but you should regulate Vcc between +4.75 and +5.25V.
Use a 7805 regulator to provide the +5V supply from a voltage above 9V.
Vcc above +6 volts can destroy inputs. If it is ever possible for the supply voltage to rise above 6 volts, then you must not connect TTL inputs to the positive rail without a 1k series resistor to limit the damage.
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