I've tried 19.07.2 and snapshot.
My TV（SONY 65x9000F） sometimes disconnected and reconnected again and again.
After I restarted radio, it's OK.
But sometimes it will do that again.
The log is here:
Line 449: Tue Apr 7 15:08:30 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 WPA: pairwise key handshake completed (RSN)
Line 450: Tue Apr 7 15:08:49 2020 daemon.notice hostapd: wlan1: AP-STA-DISCONNECTED 74:40:bb:c4:23:e9
Line 451: Tue Apr 7 15:08:49 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 IEEE 802.11: authenticated
Line 452: Tue Apr 7 15:08:50 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 IEEE 802.11: associated (aid 1)
Line 453: Tue Apr 7 15:08:50 2020 daemon.notice hostapd: wlan1: AP-STA-CONNECTED 74:40:bb:c4:23:e9
Line 454: Tue Apr 7 15:08:50 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 WPA: pairwise key handshake completed (RSN)
Line 455: Tue Apr 7 15:09:06 2020 daemon.notice hostapd: wlan1: AP-STA-DISCONNECTED 74:40:bb:c4:23:e9
Line 456: Tue Apr 7 15:09:06 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 IEEE 802.11: authenticated
Line 457: Tue Apr 7 15:09:06 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 IEEE 802.11: associated (aid 1)
Line 458: Tue Apr 7 15:09:07 2020 daemon.notice hostapd: wlan1: AP-STA-CONNECTED 74:40:bb:c4:23:e9
Line 459: Tue Apr 7 15:09:07 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 WPA: pairwise key handshake completed (RSN)
Line 460: Tue Apr 7 15:09:26 2020 daemon.notice hostapd: wlan1: AP-STA-DISCONNECTED 74:40:bb:c4:23:e9
Line 461: Tue Apr 7 15:09:26 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 IEEE 802.11: authenticated
Line 462: Tue Apr 7 15:09:26 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 IEEE 802.11: associated (aid 1)
Line 463: Tue Apr 7 15:09:27 2020 daemon.notice hostapd: wlan1: AP-STA-CONNECTED 74:40:bb:c4:23:e9
Line 464: Tue Apr 7 15:09:27 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 WPA: pairwise key handshake completed (RSN)
Line 465: Tue Apr 7 15:09:47 2020 daemon.notice hostapd: wlan1: AP-STA-DISCONNECTED 74:40:bb:c4:23:e9
Line 466: Tue Apr 7 15:09:47 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 IEEE 802.11: authenticated
Line 467: Tue Apr 7 15:09:47 2020 daemon.info hostapd: wlan1: STA 74:40:bb:c4:23:e9 IEEE 802.11: associated (aid 1)
Line 468: Tue Apr 7 15:09:48 2020 daemon.notice hostapd: wlan1: AP-STA-CONNECTED 74:40:bb:c4:23:e9