A player changing resolution, refresh rate or dynamic range can trigger a new HDMI negotiation. A short blank screen during that switch can be normal. Repeated dropouts during steady playback, however, deserve a separate connection and compatibility check.
Notice exactly when it happens
If the screen blanks once as a film begins and then remains stable, the device may be matching the programme format. If it blanks every few minutes without a content change, suspect a different issue. Write down whether sound stops too and whether the television displays a new input-mode banner.
Compare automatic and fixed modes
Temporarily disable one matching feature, then start the same programme. Resolution, frame-rate and dynamic-range matching can be separate controls. A fixed mode may reduce interruptions but introduce conversion elsewhere. Keep the combination that suits your use rather than assuming fewer switches always means a better picture.
Investigate persistent interruptions
Use a documented compatible output and a known suitable cable. Bypass an optional receiver or HDMI switch for a brief test if practical. If the problem disappears, inspect that device’s supported modes before replacing the television. Preserve the original connections and settings so you can return to the working arrangement.