Welcome to Android Central! If you have a phone that's old, cheap, and/or underpowered (i.e., weak CPU or minimal RAM), this is not surprising.
I agree with joeldf, do not use 3rd party "phone cleaners." They are terrible apps from mostly terrible developers that work counter to how Android is designed, and often are loaded with adware (and sometimes malware).
Why do you need to debug it?
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