Disable Battery Optimization so the scanning engine runs uninterrupted.
Remove conflicting apps such as other antivirus tools.
Ensure your device storage has enough free space, as low storage slows scanning.
Reinstall Avast Mobile Security >> If tׁׅhׁׅ֮ꫀׁׅܻ scan freezes repeatedly.
For help, call Avast Support @ ((+1-866-490-0338 {US}))).
A representative can fix scan-engine errors 𝕒𝕟𝕕 [ ℂ𝕒𝕃𝕃~ 
‹ +1⇢(866)⇢49O⇢O338 › ] device-compatibility issues.