Intermittent, rare 403 errors from Cloudflare

Just received another report, this time with a screenshot of the content alongside the header info:

General
Request URL: https://www.shmax.com/product_details/29280/optimus_prime_peekabot_rollin_rig
Request Method: GET
Status Code: 403
Remote Address: 104.21.93.188:443
Referrer Policy: strict-origin-when-cross-origin

Response Headers
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400
cf-cache-status: DYNAMIC
cf-ray: 7af2d6afae4c8000-IAD
content-encoding: br
content-type: text/html
date: Tue, 28 Mar 2023 21:06:44 GMT
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
report-to: {"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v3?s=txvOeiJzxLmHIREmcWTsJBH3Z9213GzyVnXOr19uLBVN98%2B5x4WQcw09vRXfY%2FZtzcVrqp9wLCEmicNcfdf92qBAJoLJxU5iiOiq7HSvf68pivdyuZP50adUuPnGgow%2F"}],"group":"cf-nel","max_age":604800}
server: cloudflare

Request Headers
:authority: www.shmax.com
:method: GET
:path: /product_details/29280/optimus_prime_peekabot_rollin_rig
:scheme: https
accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,/;q=0.8,application/signed-exchange;v=b3;q=0.7
accept-encoding: gzip, deflate, br
accept-language: en-US,en;q=0.9
cache-control: max-age=0
cookie: statistics-view1.101=brief; photos-view1.101=brief; collection-view1.101=details; wishlist-view1.101=brief; collection-sort1.101=13; 1_102_shmax\page\Products_review_submissions_v=details; 1_102_shmax\page\Products__v=details; collection-view1.102=details; statistics-view1.102=brief; 1_102_shmax\page\Parts__v=brief; 1_102_shmax\page\Products__numResults=60; 1_102_shmax\page\Photos__v=brief; collection-sort1.102=13; 1_102_shmax\page\AskDatabase__v=brief; photos-view1.102=brief; 1_102_shmax\page\Photos__numResults=60; 1_102_shmax\page\Photos__sort=a%3A2%3A%7Bs%3A4%3A%22type%22%3Bs%3A9%3A%22photoDate%22%3Bs%3A3%3A%22dir%22%3Bs%3A4%3A%22desc%22%3B%7D; 1_102_shmax\page\Products_review_submissions_sort=a%3A2%3A%7Bs%3A4%3A%22type%22%3Bs%3A11%3A%22dateUpdated%22%3Bs%3A3%3A%22dir%22%3Bs%3A4%3A%22desc%22%3B%7D; 1_102_shmax\page\Parts_review_submissions_v=brief; 1_102_shmax\page\Collectors__v=brief; 1_102_shmax\page\Products_review_submissions_numResults=60; 1_102_shmax\page\Products__sort=a%3A2%3A%7Bs%3A4%3A%22type%22%3Bs%3A7%3A%22toyline%22%3Bs%3A3%3A%22dir%22%3Bs%3A3%3A%22asc%22%3B%7D; PHPSESSID=no8g11qtaissn5qqrpccn2pp57; SMFCookie72=a%3A4%3A%7Bi%3A0%3Bs%3A3%3A%22117%22%3Bi%3A1%3Bs%3A128%3A%22a926baff6f81c26e35208c0b53e7730398403beba5f40d9e4094fe68defda2def38d5d49dcaf8caaa5635addd054dd08cbdcde78655e7b86f56f0b342bacabaf%22%3Bi%3A2%3Bi%3A1711546688%3Bi%3A3%3Bi%3A0%3B%7D
referer: https://www.shmax.com/engledogg/collection/?c_filters_toyline=1&c_filters_tags=Goodwill
sec-ch-ua: "Google Chrome";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Windows"
sec-fetch-dest: document
sec-fetch-mode: navigate
sec-fetch-site: same-origin
sec-fetch-user: ?1
upgrade-insecure-requests: 1
user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

This was in Chrome. He then tried in Edge and didn’t have any issues, but I’m not sure if that really proves anything, as we’ve seen in the past that 403 problems tend to disappear on their own on subsequent refreshes.